What other drugs will affect codeine, diphenhydramine, and phenylephrine?
Before using this medication, tell your doctor if you regularly use other medicines that make you sleepy (such as cold or allergy medicine, sedatives, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by codeine, diphenhydramine, and phenylephrine. Tell your doctor about all other medications you use, especially: • blood pressure medications; • methyldopa (Aldomet); • reserpine; • an antidepressant such as amitriptyline (Elavil, Etrafon), clomipramine (Anafranil), desipramine (Norpramin), doxepin (Sinequan), imipramine (Janimine, Tofranil), nortriptyline (Pamelor), and others; or • a beta-blocker such as atenolol (Tenormin), carvedilol (Coreg), metoprolol (Lopressor, Toprol), propranolol (Inderal, InnoPran), sotalol (Betapace), and others. This list is not complete and there may be other drugs that can interact with codeine, diphenhydramine, and phenylephrine. Tell your doctor about all your pr
