Opill stands out because of its formulation as aprogestin-only pill, commonly referred to as a minipill.

Typically, a progestin-only pill may have milder side effects than a combination pill.

The Opill works as birth control by possibly preventing ovulation in some people, Pham said.

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Illustration by Julie Bang for Verywell Health

How Effective Is Opill?

Even at 91%, it is still more effective than most non-hormonal forms of contraception.

Its effect begins 48 hours after the initial dose.

It is extremely important to take the pill on a daily basis at the same time every day.

Or they may not know to use another form of birth control if they miss a dose.

How Much Does OPill Cost?

The recommended retail price of a one-month supply of Opill is $19.99.

National Library of Medicine: DailyMed.Opillnorgestrel tablet[drug label].