What is Phenylephrine-Dextromethorphan-Guaifenesin: Uses, Warnings & Interactions

Your doctor will tell you how much medicine to use. Do not use more than directed.

Oral routeIt is best to take this medicine with food or milk.

Swallow the extended-release tablet whole. Do not crush, break, or chew it.

Your doctor will tell you how much medicine to use. Do not use more than directed.

Swallow the extended-release tablet whole. Do not crush, break, or chew it.

Oral routeIt is best to take this medicine with food or milk.

You must use this medicine on a fixed schedule. Call your doctor or pharmacist if you miss a dose.

Oral routeAsk your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.

Keep all medicine out of the reach of children. Never share your medicine with anyone.

You should not use this medicine if you have had an allergic reaction to guaifenesin, phenylephrine, or dextromethorphan. You should not use this medicine if you have high blood pressure or heart disease. You should not use this medicine if you are using MAO inhibitors such as Eldepryl®, Marplan®, Nardil®, or Parnate®. Do not give any over-the-counter (OTC) cough and cold medicine to a baby or child under 4 years old. Using these medicines in very young children might cause serious or possibly life-threatening side effects.

Decrease in how much or how often you urinate.

Make sure your doctor knows if you have diabetes, enlarged prostate, glaucoma, heart disease, high blood pressure, or an overactive thyroid.

Make sure your doctor knows if you are breastfeeding.

Depression.

Fast heartbeat.

Headache or dizziness.

Lightheadedness.

Pale lips or pale skin color.

Seizures.

Trouble breathing.

Make sure your doctor knows if you are using tricyclic antidepressants such as amitriptyline, doxepin, nortriptyline, Elavil®, or Sinequan®.

Make sure your doctor knows if you are using MAO inhibitors such as Eldepryl®, Marplan®, Nardil®, or Parnate®. Tell your doctor if you are using antiyhypertensives such as guanethidine, methyldopa, mecamylamine, or reserpine.

Make sure your doctor knows about all the other medicines that you are using.

Make sure your doctor knows if you are using beta-blockers such as atenolol, labetalol, metoprolol, nadolol, propranolol, timolol, Inderal®, or Toprol®.