Chlophedianol / guaifenesin / phenylephrine Side Effects

Medically reviewed by Drugs.com. Last updated on Nov 13, 2023.

Applies to chlophedianol / guaifenesin / phenylephrine: oral liquid.

Do not give this medication to a child younger than 4 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Do not use this medicine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.

Get emergency medical help if you have any of these signs of an allergic reaction while taking chlophedianol / guaifenesin / phenylephrine: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using chlophedianol, guaifenesin, and phenylephrine and call your doctor at once if you have a serious side effect such as:

fast, slow, or uneven heart rate;
severe dizziness or anxiety, feeling like you might pass out;
mood changes, hallucinations;
severe headache;
tremor, seizure (convulsions);
fever; or
dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, uneven heartbeats, seizure).