What you didn’t know: Antihistamines can aid sleep and relieve nausea.
If you’re having trouble sleeping, the antihistamines that help relieve the symptoms of allergy can also have a mild sedative effect, says pharmacist James Delahunty, owner of Chemist Australia. Allergy medications containing promethazine hydrochloride can be used as a temporary antidote to insomnia. Many antihistamines have the same active ingredients as travel sickness medication and can also be used to treat nausea.
This is only a short-term fix, explains Delahunty. It doesn’t take long for tolerance to kick in and this medicine will no longer help you sleep, so if insomnia is an ongoing problem, see your GP.