Cetirizine may be reasonable only if they also have clear allergy symptoms. Check with a pharmacist first if this is for a child, pregnant/breastfeeding person, someone with kidney disease, or someone using other medicines.
Get urgent help for trouble breathing, chest pain, inability to swallow/drooling, confusion, blue lips, or rapid worsening. Seek medical advice for high fever lasting over 3 days, symptoms not improving after about 10 days, or cough lasting over 3 weeks. The
NHS cold advice also recommends fluids, rest, and symptom relief rather than antibiotics for typical colds.