- A=No risk
- B=No risk in some studies
- C=There may be some risk
- D=Positive evidence of risk
Know the side effects
What are the side effects of cetirizine?
Like all drugs, this product may have side effects. If they occur, side effects are generally mild and resolve once treatment is finished or the dose is lowered. Some reported side effects include:
- Irregular heart rate
- weakness, tremors (involuntary shaking)
- Disturbed sleep or insomnia
- Blurry vision
- Decreased urination
- Constipation, diarrhea
- Dry mouth
However, not everyone experiences these side effects. In addition, some people may experience other side effects. So, if you have any concerns about a side effect, please consult your doctor or pharmacist.
Know the interactions
What drugs may interact with cetirizine?
This medication may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects.
To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist.
Drugs with known interactions:
- Other antihistamines
- Sedative-hypnotics (e.g. benzodiazepines)
If you experience an adverse drug interaction, stop taking this drug and continue taking your other medication. Inform your doctor immediately to reevaluate your treatment plan. Approaches include dose adjustment, drug substitution, or ending therapy.
Does food or alcohol interact with cetirizine?
This drug may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Do not take this medication or other antihistamines with alcohol as it may induce excessive drowsiness. Taking food with cetirizine may reduce its absorption and efficacy. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.
What health conditions may interact with cetirizine?
This drug may interact with underlying conditions. This interaction may worsen your health condition or alter the way the drug works. Therefore, it is important to always let your doctor and pharmacist know all the health conditions you currently have, especially:
Understand the dosage
The information provided is not a substitute for any medical advice. Therefore, you should always consult with your doctor or pharmacist before using any medication.
What is the dose for an adult?
Take 10 mg once a day.
For renal impairment, based on creatinine clearance (CrCL in mL/min):
- 50 to 79: Same dose, no adjustments.
- 30 to 49: Take 5 mg once a day.
- Less than 30: Take 5 mg every other day.
- Less than 10: Contraindicated; do not take.
What is the dose for a child?
Ages 2 to 6 years: Give 2.5 mg twice a day.
6 to 12 years: Give 5 mg twice a day.
For over 12 years: Give the same dose as an adult, 10 mg once a day.
How is cetirizine available?
Cetirizine is available in the following dosage forms and strengths:
- Tablet, oral: 10mg.
- Chewable tablet, oral: 5 mg, 10 mg
- Solution, oral: 1mg/ml.
What should I do in case of an emergency or overdose?
In case of an emergency or an overdose, call your local emergency services or go to the nearest emergency room.
What should I do if I miss a dose?
If you miss a dose, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.