Dyphylline / guaifenesin Side Effects
Not all side effects for dyphylline / guaifenesin may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
For the Consumer
Applies to dyphylline / guaifenesin: capsules, elixir, liquid, syrup, tablets
Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur while taking dyphylline / guaifenesin:
Headache; nausea; upset stomach.
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blood in the urine; bloody vomit; diarrhea; dizziness; excitability; fast breathing; fast/irregular heartbeat; flushing; increased thirst or urination; irritability; muscle twitching; pounding in the chest; restlessness; seizures; stomach pain; trouble sleeping; vomiting.
For Healthcare Professionals
Applies to dyphylline / guaifenesin: oral capsule, oral liquid, oral syrup, oral tablet
Cardiovascular side effects have included palpitations, tachycardia, extrasystoles, flushing, hypotension, circulatory failure, and ventricular arrhythmias.[Ref]
Endocrine side effects have included hyperglycemia and inappropriate ADH syndrome.[Ref]
Gastrointestinal side effects have included nausea, vomiting, epigastric pain, hematemesis and diarrhea.[Ref]
Nervous system side effects have included headache, irritability, restlessness, insomnia, hyperexcitability, agitation, muscle twitching, and generalized clonic and tonic convulsions.[Ref]
Renal side effects have included albuminuria, diuresis and both gross and microscopic hematuria.[Ref]
1. "Product Information. Panfil G (dyphylline-guaifenesin)." Pamlab LLC, Mandeville, LA.
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