Use another method of birth control if 1 or 2 white tab are missed or begin a pack after the proper starting day (ie, later than 1st day of the menstrual period) until the patient has taken a white tab for 7 consecutive days. Discard the rest of the pack & start a fresh pack if the patient has forgotten to take ≥3 white tab in a row. Patient missed their period 2 mth in a row. Use another method of birth control if the patient has heavy vomiting or diarrhea. Do not use in women who have or have had blood clots in the legs, lungs, or eyes, cancer of the breast or sex organs, unexplained vag bleeding, stroke or heart attack, angina pectoris, or those who suspect they may be pregnant. Young women w/o a regular menstrual cycle or w/ scanty periods should use another method of contraception. May have difficulty becoming pregnant or may fail to have menstrual periods after discontinuation. Women w/ diabetes, high BP, high cholesterol, migraine, epilepsy, gall bladder, heart or kidney disease. Discontinue at least 4 wk before & 2 wk after effective surgery or during & following a period of prolonged immobilization. Wait 4-6 wk before starting OCs after child birth. Increased risk of serious adverse effects on the heart & blood vessels w/ cigarette smoking. Concomitant use w/ antibiotics, barbiturates, or drugs used for the treatment of epilepsy or TB. Rule out pregnancy before continuing the medication.