Medicine Name: Panthor DX Syrup. Composition: Dextromethorphan Hydrobromide (10mg/5ml) + Guaifenesin (100mg/5ml) + Phenylephrine (5mg/5ml) + Chlorpheniramine Maleate (4mg/5ml). Side Effects: Nausea Stomach pain Diarrhea Upset stomach Vomiting Loss of appetite Dizziness Headache Insomnia difficulty in sleeping Rash Hives Itching Sleepiness.