Archive · 8 Oct 2026
Doctor Explains Cetirizine Dosage, Drowsiness and Rare Withdrawal
Cetirizine is a medicine that can help with allergies.
A doctor says people generally take it once a day, as recommended.
Taking extra tablets again and again can make side effects more likely.
The medicine can make some people sleepy or tired.
It can also cause problems such as dizziness or a dry mouth.
Older people and those with kidney problems should be especially careful.
Other medicines that cause sleepiness can make this effect stronger.
A few people who have taken cetirizine every day for a long time may get very itchy after they stop.
If symptoms continue or unusual effects occur, ask a doctor instead of taking more on your own.
Cetirizine is generally taken once daily at the recommended dose; taking extra doses repeatedly can raise the risk of side effects.
Common side effects include drowsiness or fatigue, and may also include dry mouth, headache, dizziness or gastrointestinal symptoms.
Older adults and people with reduced kidney function should use particular caution because the medicine is mainly cleared through the kidneys.
Other medicines that cause drowsiness may add to cetirizine’s sedating effects, so drivers and machinery operators should monitor their alertness.
After prolonged daily use, a small number of people may develop intense itching within days of stopping; persistent allergy symptoms may require another treatment approach.
- Who
- Dr Amit Saraf, director of the Department of Internal Medicine at Jupiter Hospital, Thane, provides guidance on cetirizine use.
- What
- The article explains recommended frequency, possible side effects, precautions and a rare itching reaction after stopping prolonged daily use.
- When
- The guidance applies when taking cetirizine for allergies, including after prolonged daily use or when symptoms persist.
- Where
- Jupiter Hospital in Thane is identified as Dr Saraf’s workplace.
- Why
- To explain why people should not repeatedly increase cetirizine doses themselves and when to seek medical advice.
- Typical frequency
- Generally once a day at the recommended dose.
- Common side effect
- Drowsiness or fatigue.
- Other possible effects
- Dry mouth, headache, dizziness or gastrointestinal symptoms.
- Kidney consideration
- Cetirizine is cleared mainly through the kidneys and may accumulate when kidney function is impaired.
- Possible interaction
- Other medicines that cause drowsiness may add to cetirizine’s sedating effects.
- Rare withdrawal reaction
- Some people develop intense itching within days of stopping after prolonged daily use.
- When to consult a doctor
- If symptoms persist, marked sedation or unusual symptoms occur, or frequent use involves children, pregnant women or people with significant kidney disease.