Pepper, bell pepper, chili pepper, cayenne (Capsicum annuum, C. frutescens & C. chinense).Plant Part Used: Leaf, fruit.Dominican Medicinal Uses: The leaf is traditionally prepared as a warm poultice and applied topically for skin abscesses, boils or infections, or prepared as a tea and taken orally for menstrual cramps and related disorders. The fruit is typically used for culinary and nutritional purposes and is said to increase heat in the body.Safety: No data on the safety of the leaf in humans (for internal or external use) has been identified in the available literature; however, in animal studies, topical application of the leaf did not show signs of toxicity or adverse effects. The fruit is widely consumed and considered safe in moderate amounts. Prolonged or excessive use may cause irritation of the mucosa or other adverse effects.Contraindications: No data on the safety of this plant during pregnancy, lactation or in children has been identified in the available literature. The fruit should not be taken by patients with inflammatory gastro-intestinal or renal disorders. Avoid contact with the eyes or open wounds due to potential irritation of the mucosa.Drug Interactions: Consumption of the fruit may inhibit liver microsomal enzymes and potentiate drugs metabolized by these enzymes. Aspirin and salicylic acid compounds: bioavailability may be reduced by concurrent use of peppers. Barbiturates: concomitant use of the dried fruit has been shown to potentiate the effects of hexobarbital. Anticoagulants, antiplatelet agents, thrombolytic agents: concomitant use of the fruit may increase the risk of bleeding.Clinical Data: No human clinical trials of the leaf have been identified in the available literature. The fruit has been investigated in clinical trials for the following effects: analgesic, carotenoid bioavailability enhancement, gastroprotective, swallowing dysfunction treatment and urinary incontinence treatment.Laboratory & Preclinical Data: The following biological activities of this plant have been investigated in laboratory and preclinical studies (in vitro or animal models): antimicrobial, antioxidant, antitumor, chemopreventive, cytotoxic, learning enhancement, learning impairment amelioration and renoprotective.* See entry for Ají in “Part 3: Dominican Medicinal Plant Profiles” of this book for more information, including references.