Nopal

Prickly Pear Cactus (Opuntia ficus-indica)

1. Identity and Botanical Classification

Opuntia ficus-indica, commonly referred to as prickly pear or nopal cactus, is a dicotyledonous angiosperm plant belonging to the Cactaceae family. It is characterized by its remarkable adaptation to arid and semi-arid climates in tropical and subtropical regions of the globe. Species of the Opuntia genus are native to arid and semi-arid regions of Mexico and the southern United States, but grow across various climatic zones worldwide.

When Carl Linnaeus published Species Plantarum in 1753, he placed all species of cactus known to him in one genus, Cactus. In 1754, the Scottish botanist Philip Miller divided them into several genera, including Opuntia, distinguishing the genus largely on the form of its flowers and fruits. Opuntia ficus-indica, one of several long-domesticated cactus species, is the most widespread and economically important of these cactus crops, as important as corn and tequila agave in the agricultural economy of modern Mexico.

Opuntia Mill. is the most widespread genus of Cactaceae, naturally occurring from southern South America (Argentina) to northern North America (Canada). The group has a putative origin during the Late Miocene (~7–5 million years ago) in southwestern South America, with subsequent dispersal events to northern South America, the Caribbean region, Central America, and the North American deserts.

The plant is known by several common names reflecting its broad cultural adoption:

• Common names include "nopal" in Mexico, "prickly-pear cactus" in the Southern United States, and "Indian fig cactus" in Europe.
• Additional names include Barbary pear, cactus pear, Indian fig, and Indian pear.

O. ficus-indica is a tropical and subtropical plant that grows in arid and semi-arid climates with a geographical distribution encompassing Mexico, Latin America, South Africa, and Mediterranean countries.

Plant Morphology and Used Parts

Opuntia ficus-indica is a resilient and versatile cactus species characterized by distinctive flattened pads adorned with spines, belonging to the Cactaceae family. This succulent plant is renowned for its vibrant, paddle-shaped stems and edible fruits. The flattened, leaf-like stem, or cladode, is rich in pectin, mucilage, minerals, malic acid, vitamins, and antioxidants.

Multiple parts of the plant are used medicinally and nutritionally:

• Cladodes (pads/nopal): the flattened stem segments, edible and widely studied
• Fruit (tuna): the edible berry produced by the cladodes
• Flowers: used in traditional medicine
• Seeds and seed oil: increasingly studied for their oil content

The stem, tender shoots (cladodes), flowers, fruits, dried flower powder, seed powder, and oil, as well as extracts from the various parts of the cactus plant, have all been used in traditional and commercial preparations.

Common Commercial Forms and Preparations

The cladode has been extensively investigated for bioactive compounds including phenolic analysis and antioxidant characterization of various extracts. More recently, the cladode has been used in various forms in the food and supplements market, such as various pickled products, fiber powders, or capsule-based supplements. The fruit is consumed fresh, and is processed into juices, jams, jelly, syrups, and lyophilized (freeze-dried) powders. Seed oil is cold-pressed and used in cosmetics and nutraceuticals. In the Maghreb, the plant is used for fruit production and processed products such as jams, oils, and flours, as well as for traditional medicinal purposes.

2. Traditional and Historical Use

Pre-Columbian and Mexican Traditions

Opuntioid cacti are recognized as ideal crops for arid regimes because Opuntia ficus-indica is extremely efficient at converting water into biomass. It is one of several long-domesticated cactus species and the most widespread and economically important of cactus crops, as important as corn and tequila agave in the agricultural economy of modern Mexico. The plant's deep integration into Mesoamerican cultures long predates European contact. Fruits and stems have been traditionally used in folk medicines to treat diabetes, hypertension, asthma, burns, edema, and indigestion.

In traditional medicine, Opuntia ficus-indica has been used for the treatment of burns, wounds, edema, hyperlipidemia, obesity, and catarrhal gastritis. Alcoholic extracts are indicated for anti-inflammatory, hypoglycemic, and antiviral purposes.

Spread to the Mediterranean and North Africa

Prickly pear cacti were introduced to Europe by the first Spanish colonists between the end of the 15th century and the beginning of the 16th century. Historical records indicate that the cactus pear was introduced to North Africa by the Spanish during the 16th century. Once naturalized in these regions, the plant was rapidly incorporated into local medicinal systems.

In the Maghreb, the plant is used for fruit production and processed products such as jams, oils, and flours, as well as for traditional medicinal purposes. In Algeria and Morocco, the fruits and cladodes are used to treat digestive disorders, diabetes, and skin diseases. In sub-Saharan traditional medicine, cactus flowers and fruits are given as anti-ulcerogenic or antidiarrheal agents; flowers are also administered as an oral anti-hemorrhoid medication, and cladode sap as a treatment for whooping cough.

In the popular traditions of Sicily, O. ficus-indica is employed in human medicine. In ancient remedies, the mucilage of the prickly pear cactus is used to treat coughs and whooping coughs.

African and Ugandan Traditional Use

Opuntia ficus-indica, also known as prickly pear, has been used in traditional folk medicine due to its medicinal properties that contribute to treatment of conditions including asthma, stomach ulceration, and diabetes.

Sicilian and Southern Italian Use

The commercially cultivated O. ficus-indica is grown for fruit production in Southern Italy, particularly on the island of Sicily, where over 4,000 ha of specialized plantations yield 60,000 tonnes of fruit. In Italy, particularly in Sicily and Calabria, the prickly pear is a vital resource, used for both food consumption and for medicinal purposes.

Traditional Preparations

• Fresh cladodes: boiled, grilled, or eaten raw as a vegetable (nopalitos)
• Fresh fruit: eaten out of hand or juiced
• Mucilage decoctions: prepared from cladodes for respiratory and gastrointestinal ailments
• Dried powder: from cladodes and flowers, taken orally for glycemic management
• Alcoholic extracts: used for anti-inflammatory, hypoglycemic, and antiviral purposes in Mexican traditions
• The plant has been used in traditional folk medicine because of its role in treating a number of diseases including inhibition of stomach ulceration.

3. Key Constituents and Active Compounds

The fruits of Opuntia ficus-indica represent a complex food matrix containing betalains, polyphenols, carotenoids, soluble fiber, functional amino acids, vitamins, and minerals. The composition varies significantly between the fruit pulp, peel, seeds, and cladodes, as well as among cultivars and growing regions.

Betalains

Prickly pears are rich in phenols, flavonoids, betaxanthins, and betacyanins, which favor a healthy status through hypoglycemic and hypolipidemic actions and antioxidant properties. Notably, among existing natural pigments, betalains are present at high amounts in cactus.

Betalains are water-soluble nitrogen-containing pigments; in prickly pear fruits they include betanidin, betanin, isobetanidin, isobetanin, neobetanin, phyllocactin, and gomphrenin. These betalains are potential radical scavengers with antioxidant activity reported to be 3–4 times higher than ascorbic acid, catechin, and rutin.

The two principal classes of betalains are:

• Betacyanins (red-violet pigments): primarily betanin and isobetanin
• Betaxanthins (yellow-orange pigments): most notably indicaxanthin, which is characteristic of O. ficus-indica

The pulp extracts, which were more effective than peel extracts in anti-steatotic activity, contained higher amounts of indicaxanthin (a betalain characteristic of Opuntia ficus-indica, but not all Opuntia species), lower amounts of piscidic acid, and no detectable isorhamnetin glucosides.

Flavonoids and Polyphenols

Opuntia ficus-indica is known for its high content of polyphenols exhibiting antioxidant and anti-inflammatory properties. Alkaloids, indicaxanthin, neobetanin, and various flavonoids have been isolated from the cactus, along with polysaccharides which are abundant.

The major phenolic compounds identified in cladode hydroalcoholic extract include isorhamnetin derivatives and phenolic acids, including piscidic and eucomic acids. The flavonoid isorhamnetin (a methylated metabolite of quercetin) and kaempferol derivatives are among those detected in both fruit peel and cladodes. Flavonoids such as quercetin, kaempferol, and isorhamnetin are principal bioactives identified from Opuntia ficus-indica fruits.

Dietary Fiber: Pectin and Mucilage

Opuntia cactus is an important source of bioactive compounds including carotenoids, amino acids, vitamins, fibres, betalains (betacyanins and betaxanthins), and phenolic compounds. Additionally, Opuntia polysaccharides, present in cladodes and fruits, are of particular interest due to their high content of pectic substances and mucilage, which exhibit various biological activities depending on their composition.

The stems of O. ficus-indica are rich in pectin, mucilage, and antioxidants such as polyphenols. The hypoglycemic effects may be due to decreased intestinal glucose absorption provoked by the high dietary fiber content. Dietary fiber content of the cladode was found to be approximately 56% on a dry weight basis.

Other Nutritional Constituents

The nutritional value of cactus pear fruit mainly rests on its content in ascorbic acid, vitamin E, carotenoids, fibers, amino acids, and large amounts of glucose and fructose.

The rich composition in polyphenols, vitamins, polyunsaturated fatty acids, and amino acids has been highlighted through the use of a large panel of extraction methods.

The phytochemicals present include phenols, carotenoids, flavonoids, betalains, vitamins, minerals, amino acids, amines, organic acids, lipids, and terpenes.

4. Established Mechanisms of Action

Antioxidant Mechanisms

The prickly pear has high antioxidant activity attributed to ascorbic acid, carotenoids, flavonoids, polyphenols, and betalains. The antioxidant activity of the prickly pear has been reported to be twice as high as that of other fruits such as pears, apples, tomatoes, bananas, and white grapes, with similar levels to red grapes and grapefruit. This beneficial effect is generally attributed to the ability of these compounds to fight oxidative stress and modulate the activity of various enzymes and cell receptors.

Experimental evidence suggests that the constituents of O. ficus-indica fruits interact with key molecular networks, including redox-sensitive pathways (NRF2), inflammatory signaling (NF-κB), energy-sensing regulators (AMPK), and lipid metabolism via proliferator-activated receptor alpha (PPAR-α) dependent mechanisms.

These bioactive compounds modulate key components of the redox–inflammatory–metabolic network, including activation of NRF2-mediated antioxidant responses, attenuation of NF-κB and NLRP3-dependent inflammatory signaling, and regulation of insulin-related pathways such as IRS-PI3K-AKT and AMPK.

Hypoglycemic Mechanisms

The water-holding capacity of the gel-like mucilage of O. ficus-indica may play an additional role in glucose regulation. Soluble dietary fiber has been shown to exert hypoglycemic effects mediated through inhibition of carbohydrate digestion and absorption and enhancement of peripheral insulin action.

Soluble fibers, particularly pectin and mucilage, constitute a quantitatively relevant component of the fruit matrix. By increasing luminal viscosity, soluble polysaccharides delay gastric emptying and attenuate postprandial glycemic excursions. Fermentation by gut microbiota produces short-chain fatty acids (SCFAs), including butyrate and propionate, which regulate epithelial barrier integrity, hepatic gluconeogenesis, lipid oxidation, and inflammatory signaling pathways relevant to the gut–liver axis in metabolic syndrome.

A study conducted in a murine model suggested O. ficus-indica treatment inhibits glucose absorption from the intestine and enhances glucose uptake from insulin-sensitive muscle cells through the AMPK/p38 MAPK signaling pathway.

Anti-Inflammatory Mechanisms

In human chondrocyte cultures stimulated with IL-1β, lyophilized extracts of Opuntia ficus-indica cladodes reduce the production of key molecules usually released upon chronic inflammation, such as nitric oxide (NO), glycosaminoglycans, prostaglandin-E2 (PGE-2), and reactive oxygen species.

An extract of the Opuntia ficus-indica plant diminishes the inflammatory response to stressful stimuli. The symptoms of the alcohol hangover are largely due to the activation of inflammation, and the extract appears to have a moderate effect on reducing hangover symptoms by inhibiting the production of inflammatory mediators.

Lipid Metabolism

Additional effects include modulation of lipid metabolism through SREBP-1c downregulation and PPAR-α activation, as well as potential interactions with gut barrier integrity and microbiota-related signaling.

5. Scientific Evidence by Area of Use

5.1 Blood Glucose Regulation and Type 2 Diabetes

Overview: This is the most extensively studied area of clinical application for prickly pear. Evidence is largely derived from cladode (nopal) preparations rather than the fruit.

Several randomized controlled and crossover trials have consistently reported that the ingestion of Opuntia ficus-indica cladodes (nopal) reduces postprandial glycemic excursions in patients with type 2 diabetes. Current clinical evidence indicates that cladodes exert the most consistent effects on postprandial glucose lowering, with limited or inconsistent effects on fasting glucose, HbA1c, insulin sensitivity, and lipid parameters.

Bacardí-Gascón et al. demonstrated that adding steamed nopal to a traditional Mexican breakfast significantly attenuated postprandial glucose area under the curve (AUC) without altering fasting glucose.

A systematic review published in Medicina (2019) searched six electronic databases following PRISMA guidelines and examined human intervention trials: Initially, 335 articles were sourced and filtered, resulting in 20 relevant articles. The included studies were characterized by plant components including fruit (n = 4), cladode (n = 12), and other Opuntia spp. products (n = 4), further separated by clinical populations including healthy, hyperlipidemic, hypercholesterolemic, and type 2 diabetes mellitus subjects. Prickly pear fruit was predominantly reported to have no significant effects on glucose or insulin. The cladode preparations showed more consistent postprandial glucose-lowering effects, particularly in T2DM populations.

A pilot study in 24 non-diabetic males with primary hypercholesterolemia or combined hyperlipidemia examined 250 g/day of prickly pear edible pulp (Opuntia robusta) for 8 weeks after an 8-week diet run-in: Prickly pear led to a decrease in total cholesterol (12%), low-density lipoprotein-cholesterol (15%), apolipoprotein B (9%), triglycerides (12%), fibrinogen (11%), blood glucose (11%), insulin (11%), and uric acid (10%), while body weight, high-density lipoprotein-cholesterol, apolipoprotein A-I, and lipoprotein(a) remained unchanged. The hypocholesterolemic action of prickly pear may be partly explained by the fiber (pectin) content, but the hypoglycemic actions (improvement of insulin sensitivity) in the non-obese, non-diabetic need further investigation to get more insights on the potential advantage of treating the metabolic syndrome.

Evidence strength: Moderate but heterogeneous. The existing body of randomized trials is small, varies considerably in methodology, preparation form, and population. Postprandial glucose lowering by cladodes is the most reproducibly demonstrated effect in humans. Evidence for improvements in fasting glucose, HbA1c, or insulin sensitivity is inconsistent. The findings of the 2019 systematic review indicate variations in effects between cacti components and products.

5.2 Body Weight and Cardiovascular Risk Factors

A systematic review and meta-analysis (Onakpoya et al., 2015, University of Oxford) searched Medline, Embase, Amed, Cinahl, and the Cochrane Library and identified seven eligible randomized clinical trials, of which five were included in the analysis:

The evidence from randomized clinical trials does not indicate that supplementation with OFI generates statistically significant effects on body weight. Consumption of OFI can cause significant reductions in percentage body fat and blood pressure.

The results from the meta-analysis of published clinical trials do not indicate that OFI supplementation has significant beneficial effects on body weight. OFI intake was found to cause significant reductions in body mass index and percentage body fat; however, the effect sizes are small and do not reach clinical significance. Few clinical trials evaluating the effects of OFI in obesity management have been conducted; they vary in design and methodology.

With respect to blood pressure: Meta-analysis of two RCTs revealed a significant reduction in systolic blood pressure favoring OFI over controls (MD = 0.88 mmHg; 95% CI, −1.76 to −0.01; I² = 0%; P = 0.05). A significant reduction in diastolic blood pressure favoring OFI was also observed (MD = 1.14 mmHg; 95% CI, −1.61 to −0.67; I² = 0%; P < 0.00001).

With respect to lipids: One RCT reported no significant differences between OFI and controls for total cholesterol, LDL-C, HDL-C, and triglycerides (P > 0.05 for all comparisons). OFI appears to cause significant reductions in systolic and diastolic blood pressure. Few clinical trials evaluating the effects of OFI have been published; they vary in design and methodology, and the majority are characterized by flaws in reporting quality.

Evidence strength: Weak to moderate. The number of included trials is small, effects on body weight are statistically non-significant, and blood pressure reductions are statistically significant but very small in absolute magnitude. Lipid effects are inconsistent across trials.

5.3 Antioxidant Status in Humans

A clinical trial published in Scientific Reports (2025) enrolled 50 healthy participants aged 18 and older (male and female) who received a daily OFI supplement of 1,500 mg for 3 months:

The findings revealed a significant 48.1% increase in salivary total antioxidant capacity (TAC) (P < 0.001), indicating improved antioxidant activity. Simultaneously, oxidative stress biomarkers showed substantial reductions: malondialdehyde (MDA) decreased by 28.3%, nitrotyrosine (3-NT) decreased by 51.5%, and 8-hydroxy-2'-deoxyguanosine (8-OHdG) decreased by 59.8% (P < 0.001).

Most studies investigating the effects of OFI have been limited to pre-clinical models, highlighting the need for further validation through clinical trials.

An earlier study (Tesoriere et al., 2004, published in American Journal of Clinical Nutrition) assessed supplementation with cactus pear (O. ficus-indica) fruit and found that it decreased oxidative stress in healthy humans in a comparison with vitamin C.

Evidence strength: Preliminary in humans. The 2025 trial was a single-arm study without a placebo control. The 2004 comparative study provides supporting evidence. Pre-clinical evidence is robust, but controlled human trials remain limited.

5.4 Alcohol Hangover

A rigorous double-blind, placebo-controlled crossover trial (Wiese et al., 2004, published in Archives of Internal Medicine) examined OFI extract for the attenuation of alcohol hangover:

The severity of the alcohol hangover may be related to inflammation induced by impurities in the alcohol beverage and byproducts of alcohol metabolism. An extract of OFI diminishes the inflammatory response to stressful stimuli. In this double-blind, placebo-controlled crossover trial, 64 healthy, young adult volunteers were randomly assigned to receive OFI (1,600 IU) and an identical placebo, given 5 hours before alcohol consumption. During 4 hours, subjects consumed up to 1.75 g of alcohol per kilogram of body weight. Hangover severity (9 symptoms) and overall well-being were assessed on a scale (0–6), and blood and urine samples were obtained the following morning. Two weeks later, the study protocol was repeated with OFI and placebo reversed. Fifty-five subjects completed both arms of the study.

The symptoms of the alcohol hangover are largely due to the activation of inflammation. An extract of the OFI plant has a moderate effect on reducing hangover symptoms, apparently by inhibiting the production of inflammatory mediators.

Several studies have evaluated the benefits of Opuntia ficus-indica against symptoms of alcohol hangover in humans. The cause of severity of the alcohol hangover can be, at least in part, inflammation and disruption of lipid metabolism homeostasis.

Evidence strength: Moderate, based on one well-designed RCT. The Wiese 2004 trial is methodologically sound (crossover, double-blind, placebo-controlled), but represents a single study and used a proprietary extract. Independent replication is limited.

5.5 Gastrointestinal Protection

The protective activity of prickly pear cactus fruit juice and its main constituent, betanin, were evaluated against stress-induced acute gastric lesions in rats. Pretreatment with lyophilized powder containing O. ficus-indica var. saboten fruit juice and maltodextrin (OFSM), and betanin, significantly reduced stress lesions (doses of 800–1,600 mg/kg). Both OFSM and betanin effectively prevented the decrease in gastric mucus content. In addition, OFSM significantly suppressed water immersion restraint stress-induced increases in the level of gastric mucosal tumor necrosis factor-α and myeloperoxidase (MPO).

In the rat, the effect of mucilage obtained from cladodes on the healing of ethanol-induced gastritis appears correlated with a restabilization of plasma membranes in damaged gastric mucosa.

Evidence strength: Preclinical only. Gastrointestinal protective effects are supported by animal and in vitro studies but have not been adequately validated in human clinical trials.

5.6 Liver/Metabolic Syndrome

Opuntia ficus-indica exhibits antioxidant, anti-inflammatory, and anti-hyperglycemic properties, making it a promising candidate for the prevention and treatment of metabolic dysfunction-associated fatty liver disease (MAFLD). However, its effects on triglyceride accumulation remain largely unexplored.

The pulp extracts of Pelota and Colorada varieties, as well as both peel and pulp extracts of Sanguinos, were effective in reducing palmitic acid-induced triglyceride accumulation in AML12 hepatocytes (in vitro).

In a murine model (high-fat diet-fed mice), OFI fruit supplementation, as well as chromium picolinate, improved glucose tolerance and insulin sensitivity (evaluated as HOMA-IR) and increased hepatic and adipose tissue insulin receptor expression.

Standardized human intervention studies are required to quantify the magnitude and reproducibility of these effects in established metabolic syndrome populations.

Evidence strength: Preliminary; preclinical only. Anti-steatotic and insulin-sensitizing effects are supported by cell and animal models; human data are lacking.

5.7 Anti-Inflammatory Properties (General)

In vitro and in vivo studies are convergent in concluding that Opuntia ficus-indica extracts exhibit antioxidant and anti-inflammatory properties. The models and conditions in which these properties are highlighted support the prospect of further pharmacological exploration and development.

OFI has attracted much attention as a source of antioxidant and anti-inflammatory compounds. Research has examined whether the antioxidant content of OFI cladode extract may improve adipocyte dysfunction resulting from inflammatory stimulation of hypertrophic adipocytes, evaluating properties of OFI cladode hydroalcoholic extract in terms of antioxidant activity, regulation of adipocyte inflammation, and adipocyte/monocyte interaction in human adipocytes rendered dysfunctional by the proinflammatory cytokine tumor necrosis factor-α (TNF-α).

Evidence strength: Largely preclinical. In vitro evidence is consistent. Human clinical data specifically targeting inflammatory biomarkers as primary endpoints remain limited.

6. Body Systems and Health Areas of Association

• Metabolic / Endocrine System: Blood glucose regulation, insulin sensitivity, type 2 diabetes management (strongest clinical evidence for postprandial glucose)
• Cardiovascular System: Blood pressure reduction, cholesterol and lipid modulation; effects are modest and inconsistent across trials
• Gastrointestinal System: Ulcer protection, gastric mucosal defense, antidiarrheal use (primarily traditional and animal-model evidence)
• Hepatic System: Anti-steatotic activity, lipid accumulation reduction (in vitro and animal evidence only)
• Oxidative Stress / Antioxidant Defense: Reduction of systemic oxidative stress markers (limited human evidence, robust in vitro evidence)
• Immune / Inflammatory: Attenuation of inflammatory mediators, used in hangover context (one well-designed RCT)
• Body Composition: Small reductions in percentage body fat and BMI in meta-analysis; no significant effect on body weight
• The fruit contains valuable compounds such as flavonoids, phenolics, ascorbic acid, betanin, and essential elements; it exhibits diverse pharmacological activities including antioxidant, anti-inflammatory, anti-tumor, neuroprotective, hepatoprotective, hypotensive, anti-diabetic, antifungal, and anticancer effects. (Note: many of these effects are preclinical.)

7. Dosage Forms and Reported Dosages

When using commercial products, manufacturer guidelines should be followed. O. ficus-indica dosing, dose forms, and treatment durations used in clinical trials have varied.

The following dosages were specifically reported in identified studies:

• Hangover (Wiese et al., 2004 RCT): OFI extract at 1,600 IU given 5 hours before alcohol consumption.
• Antioxidant study (Scientific Reports, 2025): Fifty healthy participants received a daily OFI supplement of 1,500 mg for 3 months.
• Hyperlipidemia pilot study (Wolfram et al., 2002): In 24 non-diabetic, non-obese males suffering from primary isolated hypercholesterolemia or combined hyperlipidemia, 625 kJ were replaced by prickly pear edible pulp (250 g/day) for 8 weeks.
• Gastric lesion (animal, Opuntia ficus-indica var. saboten): Pretreatment with lyophilized powder containing O. ficus-indica var. saboten fruit juice and maltodextrin, and betanin, significantly reduced stress lesions at doses of 800–1,600 mg/kg. (This is an animal study; mg/kg doses are not translatable directly to human use.)
• Antidiabetic (animal cladode flour, Abubakar et al.): Streptozotocin-induced diabetic rats treated with medium cladode flour (MCF) and small cladode flour (SCF) at doses of 50 mg/kg body weight showed reductions in postprandial blood glucose of 46.0% and 23.6%, respectively. (Animal study only.)

No universally accepted or pharmacopeial standardized human dose has been established for any indication. Dosages and preparation forms (fresh cladode, dried powder, juice, extract, capsule) differ substantially across trials and commercial products.

8. Safety Considerations and Known Interactions

General Safety Profile

Different parts of the plant, including the fruit pulp and peel, cladodes (pads), and seeds, have been scientifically studied, and they have demonstrated therapeutic potential while being considered safe for human consumption.

Dermatitis is the most common adverse reaction to prickly pear. Physical contact with the cactus spines and fine bristles (glochids) can cause skin irritation, and contact dermatitis has been reported. Information regarding safety and efficacy in pregnancy and lactation is lacking.

Interaction with Antidiabetic Medications

The most clinically significant documented interaction is with blood glucose-lowering drugs. Literature suggests that prickly pear cactus (PPC) has an effect on lowering blood glucose levels in patients with type 2 diabetes mellitus, although few data describe adverse drug reactions (ADRs) from combining PPC with other agents used in treating type 2 diabetes mellitus. A literature search revealed at least one case report describing the blood glucose-lowering effect of PPC in a patient concurrently taking oral antihyperglycemics, documenting an episode of hypoglycemia. One patient survey identified the most common drug-herbal interaction in the given population to be between PPC and antihyperglycemic agents, resulting in hypoglycemia.

In a clinical survey of 804 patients, 8 cases of hypoglycemia in diabetics taking nopal (prickly pear cactus) were observed, rated as mild in severity.

Based on the reported pharmacodynamic synergism, the following drug classes require monitoring when co-administered with OFI:

• Opuntia ficus-indica increases effects of acarbose by pharmacodynamic synergism. Use caution/monitor.
• It increases effects of glimepiride by pharmacodynamic synergism. Use caution/monitor.
• It increases effects of glipizide by pharmacodynamic synergism. Use caution/monitor.
• It increases effects of glyburide by pharmacodynamic synergism. Use caution/monitor.
• It increases effects of insulin aspart by pharmacodynamic synergism.

Perioperative Considerations

Given the documented blood glucose-lowering activity, prickly pear preparations may affect intraoperative and postoperative glycemic control, which is clinically relevant in surgical patients, particularly those with diabetes.

Hypersensitivity

Use is contraindicated in individuals with hypersensitivity to any components of prickly pear.

Evidentiary Gaps

While OFI appears to cause significant reductions in blood pressure, few clinical trials evaluating the effects of OFI have been published; they vary in design and methodology, and the majority are characterized by flaws in reporting quality. The overall conclusion of multiple systematic reviews is that, while preclinical evidence is promising and mechanistically rich, adequately powered, well-controlled human trials for most proposed indications remain insufficient to support definitive clinical recommendations.

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