More About Combination Pill
Each brand or type of pill will contain a different combination dose of estrogen and progestin. The combination of hormones within the pill suppresses ovulation; which means that it keeps the ovaries from releasing an egg. Depending on the dose, some pills extend the ovulation cycle, allowing for fewer menstruation periods. Typically, oral contraceptives must be taken every day to be effective, and do not protect against STIs or HIV.