Before taking diphenhydramine,
tell your doctor and pharmacist if you are allergic to diphenhydramine or any other medications.
tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: other diphenhydramine products (even those that are used on the skin), other medications for colds, hay fever, or allergies; medications for anxiety, depression or seizures; muscle relaxants; narcotic medications for pain; sedatives; sleeping pills; and tranquilizers.
tell your doctor if you have or have ever had asthma, emphysema, chronic bronchitis, or other types of lung disease; glaucoma (a condition in which increased pressure in the eye can lead to gradual loss of vision); ulcers; difficulty urinating (due to an enlarged prostate gland); heart disease; high blood pressure; seizures; or an overactive thyroid gland.If you will be using the liquid, tell your doctor if you have been told to follow a low-sodium diet.
tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking diphenhydramine, call your doctor.
if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking diphenhydramine.
you should know that this medication may make you drowsy. Do not drive a car or operate machinery until you know how this medication affects you.
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