About cetirizine dihydrochloride
Second-generation antihistamine
Used for
- Relief of hay fever and other allergic rhinitis symptoms
- Relief of hives and itchy allergic skin reactions
Usual adult dose
Usually 10 mg once daily for allergies or hives.
Usual dose in children
Ages 6–11: usually 5 mg twice daily. Under 6: dosing depends on age and formulation.
Common side effects
- Sleepiness or tiredness
- Dry mouth
- Headache
- Dizziness
Important warnings
- May cause drowsiness; use care with driving or machinery.
- Avoid alcohol and other medicines that cause sleepiness.
- Dose may need adjustment in kidney disease.
- Seek urgent care for severe allergic symptoms, such as trouble breathing.
Pregnancy
Generally considered low risk when needed; use during pregnancy should be discussed with a healthcare professional.
Breastfeeding
Small amounts may enter breast milk; occasional use is generally considered compatible, but monitor for infant sleepiness.
Interactions
- Alcohol and sedating medicines may increase drowsiness.
- Theophylline may slightly increase cetirizine exposure.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.