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Birth control, also known as contraception, is designed to prevent pregnancy choice of birth control should depend on several factors. These include health, frequency of sexual activity, number of sexual partners and desire to have children in the future. Interactions between hormonal contraceptives and other medications can cause alteration of therapeutic medication level, increased toxicity, and decreased contraceptive efficacy. Combined hormonal contraceptives (CHCs) include products with estrogen and progestin, including oral contraceptives, hormonal patches, and vaginal rings. Physicians and pharmacists believe that broad-spectrum antibiotics decrease the effectiveness of combined oral contraceptives (COCs).