Paracetamol: Skin rashes & other hypersensitivity reactions. Tramadol HCl: Nausea, vomiting, constipation, drowsiness & confusion; dry mouth, dizziness sweating, facial flushings, headache, vertigo, bradycardia, tachycardia, palpitations, orthostatic hypotension, hypothermia, restlessness, changes of mood, decreased libido or potency, hallucinations, miosis.