Amazon is limiting how many emergency contraceptives consumers can buy, joining other retailers who put in place similar caps following the Supreme Court decision overruling Roe v. Wade.

Amazon’s limit, which temporarily caps purchase of the contraceptives at three units per week, went into effect on Monday. The company did not share further details on what emergency contraceptive products were limited for purchase, but a listing showed the cap applied to Plan B, the popular “morning after” pill.

A similar policy went into effect Monday at the drugstore chain Rite Aid, which has limited the purchase of Plan B pills to three units per customer due to increased demand. The limit applies to both in-store and online purchases.

Emergency contraception is different from abortion pills used to end a pregnancy. Plan B, which can be obtained without a prescription, contains a concentrated dose of the same drug found in many regular birth control pills. If a woman takes Plan B within 72 hours of unprotected sex, she can lower the risk of pregnancy significantly. But if she’s already pregnant, the pill has no effect.

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