Woman sticking out tongue with pill on, close-up

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During pregnancy, your body will amaze you, and not always in a good way. Constipation? Sciatica? Swollen everything? It’s all worth it in the end, of course, but there’s no end to all the new ways you can feel discomfort.

Moms who have been there just love sharing advice on how to deal. Some of it is good (oatmeal is a great sleep-inducing snack), while some of it is a little questionable (cure swollen feet by rubbing toothpaste on them?). Some moms swear that the worst thing about their pregnancy was the morning sickness, and that the thing that finally stopped it was the over-the-counter sleep aid Unisom. If you’ve never heard this morning sickness advice before, it can sound sort of troubling. Why would you take a sleeping pill to stop nausea? After all, it says, “Don’t take if you’re pregnant” right on the label! Well, here are the details on this curious cure.

Until the early 1980s, there was a drug named Benedictine that prevented morning sickness. It worked pretty well, but the FDA forced it off the market over some concerns about side effects. Unisom has the same active ingredient that Benedictine did – in fact, if you take Unisom and add a vitamin B6 supplement, it’s virtually the same thing. Since the old drug worked to ease morning sickness for so many women, some gynecologists today recommend that women take Unisom and B6 together to get the same relief.

Lots of doctors feel that this morning sickness remedy is perfectly safe—yours might, too. But definitely check before you start taking it, just to make sure. And it’s probably a good idea to try natural remedies or other home cures for morning sickness before then, in case something simpler does the trick.