Find & Manage Your Patient Assistance Programs
Estimated patient savings $600,000,000.00

Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.


(poh-TASS-ee-um EYE-oh-dyed/eff-ED-rin)



This medication is used to treat symptoms associated with colds, allergies, sinus infections or other respiratory illnesses.

How To Use

Take this by mouth as directed with a full glass (8 oz or 240 ml) of water, unless your doctor directs you otherwise. Take this with meals or a snack to reduce stomach upset. Do not increase your dose or take this more often than directed since your condition will not improve any faster but the risk of side effects will be increased.

Side Effects

Headache, nausea, diarrhea, stomach upset or anxiety may occur. If any of these effects continue or become severe, inform your doctor. Notify your doctor if you develop: chest pain, leg weakness, rapid or irregular pulse, skin rash, itching, difficulty urinating, metallic taste, swelling tongue or throat, vomiting, mental confusion, tremors. If you notice other effects not listed above, contact your doctor or pharmacist.


Before taking this, tell your doctor if you have: kidney disease, thyroid disease, tuberculosis, heart disease, asthma, high blood pressure, diabetes, glaucoma, a history of seizures, an enlarged prostate, allergies (especially to drugs or iodine). This medication is not recommended for use during pregnancy. Consult your doctor before using this medication. This medication passes into breast milk and may have undesirable effects on a nursing infant. Consult your doctor before breast-feeding.

Drug Interactions

Tell your doctor of any nonprescription or prescription medication you may take, particularly: lithium, potassium supplements, high blood pressure drugs, antidepressants, psychiatric medicines, thyroid hormones, water pills, furazolidone. Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately.


Drink plenty of fluids, especially water while taking this medication. It will help to break up mucus and clear congestion.

Missed Dose

If you miss a dose, take it as soon as remembered; do not take it if it is near the time for the next dose. Instead, skip the missed dose and resume your usual dosing schedule. Do not "double-up" the dose to catch up.


Store at room temperature between 59 and 86 degrees F (15 to 30 degrees C) away from heat and light. Do not store in the bathroom.