Paracetamol: Hepatotoxicity w/ alcohol. Increased effects of aceclofenac, aldosterone, atorvastatin, prednisone, NSAIDs & warfarin. Phenylpropanolamine HCl: Decreased broncho dilatory effects by β-blockers, clozapine. Hypokalemia w/ diuretics. Dextromethorphan HBr: Decreased metabolism w/ celecoxib, chloramphenicol, vit D. Increased serum levels w/ colchicine, doxorubicin, & phenytoin. Increased serotonergic activities w/ sertraline, toloxatone, alosetron, amphetamine & citalopram. Chlorpheniramine maleate: Co-administration w/ alcohol, antihistamines, CNS depressants, & sedatives.