Reswas Syrup is a combination of two medicines: Chlorpheniramine Maleate and Levodropropizine, which relieves dry cough. Chlorpheniramine Maleate is an antiallergic which helps reduce cough associated with allergies by blocking the effects of a chemical messenger, histamine.

This analysis indicates that levodropropizine is an effective antitussive drug in children and adults, with statistically significant better overall efficacy outcomes vs. central antitussive drugs (codeine, cloperastine, dextromethorphan) in terms of reducing cough intensity and frequency, and nocturnal awakenings.