Before using doxylamine, tell your doctor if you have glaucoma, kidney disease, an enlarged prostate, problems with urination, a stomach ulcer or obstruction, or a chronic lung disease such as bronchitis or emphysema.
Use this medication as directed on the label, or as your doctor has prescribed. Do not use the medication in larger amounts or for longer than recommended.
Do not give this medicine to a child younger than 12 years old without the advice of a doctor.
If you miss a dose, take it as soon as you remember. It is best to take doxylamine only when you can devote several hours to sleep. If it is almost your normal waking hour, skip the missed dose and wait until you are ready for bed again. Do not use extra medicine to make up the missed dose.
There may be other drugs that can interact with doxylamine. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.
Get emergency medical help if you think you have used too much medicine, or if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Avoid drinking alcohol while you are taking this medication. It can add to drowsiness caused by an antihistamine.