Taking extra cetirizine can raise the risk of drowsiness and dizziness

Cetirizine is an allergy medicine usually taken once a day at the recommended dose.

Taking it more often can increase the risk of sleepiness, dizziness and reduced alertness.

People with kidney problems, older adults and those taking other medicines that cause drowsiness may need extra caution.

If symptoms continue, ask a doctor about another treatment rather than taking extra doses.