Which medicine should I take for a severe, three-day cold with a constant runny nose, watery eyes, and tiredness, and can I use Sinarest, Allegra, or Zyrtec?
For your runny nose and watery eyes, antihistamines like Allegra (fexofenadine) or Zyrtec (cetirizine) can help, but they won't relieve general cold symptoms. Sinarest, which contains paracetamol, a decongestant, and an antihistamine, is often more effective for a multi-symptom cold, though it may make you drowsy. Please do not combine these medications, as they contain overlapping ingredients. Rest, drink plenty of fluids, and please see a doctor if your symptoms worsen.