White Oval 4H2 Pill: Identification, Uses, Side Effects, Dose

4H2 is an imprint on a white oval shape tablet. The active constituent in this 4H2 pill is Cetirizine hydrochloride. This belongs to a group of drugs known as Antihistamines. It is much less likely to make you sleepy than other antihistamines.

4H2 Pill Identification

Quick overview of a white and oval pill with 4H2;

  • Imprint: 4H2
  • Generic: Cetirizine Hydrochloride
  • Brand: Zyrtec
  • Strength: 10 mg.
  • Supplied By: Perrigo Pharmaceutical company
  • Color: White
  • Dosage Form: Tablet
  • Class: Antihistamine

4H2 Pill

White Oval 4H2 Pills Uses

A white oval pill 4h2 contains Cetirizine, which is used to treat allergic symptoms such as:

Seasonal Allergic Rhinitis

Symptoms include

  • Sneezing,
  • Nasal pruritus,
  • Ocular pruritus,
  • Rhinorrhea,
  • Tearing, and
  • Redness of the eyes

Perennial allergic rhinitis:

Symptoms include

  • Nasal pruritus,
  • Rhinorrhea,
  • Sneezing,
  • Postnasal discharge,
  • Tearing
  • Ocular pruritus, and

Chronic urticaria:

Symptoms include

  • Batches of red or skin-colored.
  • Welts that vary in size and change shape
  • Itching, which may be severe

4H2 Pill Side Effects

Cetirizine can cause the following side effects

  • Excessive tiredness
  • Drowsiness
  • Stomach pain
  • Dry mouth
  • Vomiting
  • Diarrhea

This is a partial list of adverse effects. Consult your GP about any unexpected side effects you have while taking Cetirizine.


Avoid the 4H2 Pill (Cetirizine) and ask your doctor for advice. Avoid it if you

  • Have predisposition factors for urinary retention
  • Have liver or kidney problems,
  • Are scheduled for allergy testing.
  • Are an epileptic individual or a patient at risk of convulsions
  • Do not chew and break cetirizine extended-release tablets and capsules.

4H2 Pill Contraindications

4h2 pill is contraindicated in the following conditions

  • Hypersensitivity reaction to this drug
  • It is also contraindicated in the case of kidney disease.


Cetirizine’s recommended dose for treating hay fever, hives, or allergies is 5 to 10 mg (milligram). The maximum recommended dose of Cetirizine is 10 mg (milligram) daily.

The dose may be based on the following:

  • Other medications you are taking
  • The condition being treated
  • how do you respond to this medication
  • your body weight, height, age, and gender.

4H2 Pill- Interactions

Tell your doctor about all your medication, including the prescription and over-the-counter medicine. Cetirizine can interact with the following medicine

  • Bosutinib
  • Ponatinib
  • Lomitapide
  • Lurasidone
  • Lopinavir-ritonavir
  • Phenelzine
  • Clobazam
  • Ritonavir
  • Vemurafenib
  • Crizotinib

This is not a complete list of medications that interact with the pill with 4H2. Tell your doctor about the drugs you are already taking.

Frequently Asked Questions

1. What is the 4H2 pill?

Pill 4H2 is an oval tablet belonging to the antihistamines group. The main component of this medicine is cetirizine hydrochloride. This medicine treats hay fever, seasonal allergies, allergic rhinitis, urticaria, and hives.

2. How does the 4H2 Pill work?

It works by blocking the histamine produced by the body during an allergic reaction. Histamine can cause Sneezing, Itching, tearing, and cold symptoms.

3. How should I take pill 4H2 (Cetirizine)?

Take Cetirizine precisely as indicated on the label or as your doctor prescribes. Please only use it in limited quantities or longer than recommended. You can take Cetirizine with or without food.

4. What happens if I miss a dose of the 4H2 pill?

Take the missed quantity as soon as you remember when it is almost time to take the next dose, wait for the medicine, and skip the missed dose. Do not take any additional medication to make up for the missed dose.

5. What happens with an overdose of Cetirizine?

Contact an ambulance if you have taken too much of this medicine. The overdose symptoms may include restlessness or nervousness, and you want to sleep.

6. What should I avoid?

If you are taking regular medications that make you sleepy (e.g., cold or allergy medicines, narcotics, sleeping pills, muscle relaxants, anticoagulants, depression, or anxiety), talk to your doctor. They can worsen the drowsiness caused by Cetirizine. In addition, Cetirizine may cause side effects that may affect your thinking or reactions. Be careful when driving or doing something that requires alertness. Avoid drinking alcohol. It can intensify some of the side effects of Cetirizine.

7. Can I take the 4H2 pill during pregnancy?

If you are pregnant or planning to become pregnant, talk to your doctor before taking Cetirizine. Cetirizine is usually not recommended during pregnancy.

8. Can I take Cetirizine (4H2 tablet) while breastfeeding?

Breastfeeding your baby is not recommended. This is because the drug can pass into breast milk.

9. Can I drive or operate machinery after taking this product?

Do not drive or use machines when you are sleepy. These tablets do not cause drowsiness at the recommended dose in most patients.

10. How do you store cetirizine hydrochloride (4H2 tablet)?

Keep this medicine out of sight and out of reach of children. Only take the tablets on the blister and package them after the expiry date. The expiry date refers to the last day of that month. Do not dispose of medicines on wastewater or waste. Ask your pharmacist to remove the drugs you no longer use. These measures contribute to protecting the environment.

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