"About 90% of the time it will prevent pregnancy," says Robert Cambray M.D.
The pill can be sold to women and men 18 years or older, only requiring an I.D.
"People have been waiting for it a long time we've had request for it for months and months already," says, Pharmacist Richard Kilmer.
But the morning after pill has brought up a lot of questions, many people wanting to know if their insurance will cover the pills.
"Most people end up paying for it out of pocket they don't bill it on their insurance a lot of insurance companies won't pay for plan B," says Kilmer.
Madison's Community Pharmacy is selling the pills for $35.
While physicians say the pill is safe, there are side effects.
"Its main side effects are a lot of nausea and vomiting and you may have early menstrual perhaps a little heavier menstrual period than you otherwise would," says Cambray.
Plan B comes with two tablets designed to give people a second chance to prevent pregnancy.
Doctors say both pills must be taken within 12 hours or else it may not work.
The FDA approving the drug as over the counter upset many, others believe it will lower teen pregnancies.
"Having access to the morning after pill doesn't make people behave more irresponsibly in fact having assess to contraception helps women make responsible choices," says Kelda Helen Roys with Naral Pro-Choice Wisconsin.
Still some are comparing it to abortion, doctors say otherwise.
"The plan B does not interrupt a pregnancy that has already been established so it does not cause abortion," says Cambray
Doctors say you should not confuse the morning after pill with RU-486, that's the abortion pill and is different.