Guaifenesin, Dextromethorphan, and Phenylephrine Side Effects and Warnings

What are the precautions when taking this medicine?

• Check medicines with healthcare provider. This medicine may not mix well with other medicines.

• If you have PKU, talk with healthcare provider. Some products do contain phenylalanine.

• If you have high blood pressure, talk with healthcare provider.

• If you have diabetes, talk with healthcare provider.

• If you have thyroid disease, talk with healthcare provider.

• If you have glaucoma, talk with healthcare provider.

• Tell healthcare provider if you are pregnant or plan on getting pregnant.

• Tell healthcare provider if you are breast-feeding.

What are some possible side effects of this medicine?

• Nervous and excitable.

• Dry mouth. Frequent mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.

• Inability to sleep.

• Feeling dizzy. Rise slowly over several minutes from sitting or lying position. Be careful climbing.

• Headache.

• Nausea or vomiting. Small frequent meals, frequent mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.

Reasons to call healthcare provider immediately

• If you suspect an overdose, call your local poison control center or emergency department immediately.

• Signs of a life-threatening reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; fits; or swelling of face, lips, tongue, or throat.

• Persistent cough.

• Chest pain or pressure or fast heartbeat.

• Severe dizziness or passing out.

• Difficulty breathing.

• Feeling extremely tired or weak.

• Severe headache.

• Any rash.

• No improvement in condition or feeling worse.