Chlorpheniramine belongs to the antihistamine group of drugs and is used to relieve symptoms of allergies, including sneezing, runny nose, itchy eyes, and hives. It works by blocking histamine, a substance that causes allergic symptoms. It’s a first generation antihistamine, which can cause more drowsiness than newer, less sedating antihistamines. Not all chlorpheniramine products are the same. Formulations, strengths, and combination products can vary.

Common Uses of Chlorpheniramine

• Seasonal allergies, also called hay fever.
• Allergic rhinitis.
• Urticaria, meaning hives.
• Some cold symptom combination products may contain chlorpheniramine to relieve runny nose and sneezing.

Dosage and Administration

• Adults. For a 4 mg immediate release oral product, the usual labeled dose is 4 mg every 4 to 6 hours, with a maximum of 24 mg in 24 hours. Different formulations, strengths, and combination products may have different dosing instructions; always follow the specific product label or your doctor’s instructions.
• Children. Dosing depends on age, formulation, strength, and the specific product label. For a 4 mg oral product, a commonly labeled dose for children 6 to 12 years is 2 mg every 4 to 6 hours, but this applies specifically to that formulation and product label, not universally to every chlorpheniramine product.
• Children under 6. Do not use an OTC chlorpheniramine product unless a doctor specifically recommends an age appropriate formulation. Young children may be more sensitive to antihistamine side effects.
• Chlorpheniramine is available in oral tablets and syrup.
• Avoid alcohol and other sedating medicines while taking chlorpheniramine, as they can increase drowsiness.
• Use caution when driving or operating machinery until you know how it affects you.

Adverse Effects of Chlorpheniramine

• Drowsiness.
• Dry mouth. Dizziness.
• Blurred vision.
• Difficulty urinating, particularly in men with an enlarged prostate.
• Constipation or confusion, particularly in older adults.

Precautions in Older Adults

Older adults are generally more sensitive to chlorpheniramine’s sedating and anticholinergic effects, including drowsiness, confusion, dizziness, blurred vision, constipation, and difficulty urinating, which can also increase the risk of falls. Regular use should be discussed with a doctor or pharmacist. A newer, less sedating antihistamine may sometimes be preferred, though this isn’t a universal rule for every person.

Breathing Problems and Other Precautions

Breathing problems such as asthma or chronic lung disease. Ask a doctor before using chlorpheniramine. It should not be relied upon to treat an acute asthma attack.

Drug Interactions

MAO inhibitors. Do not use chlorpheniramine with an MAO inhibitor or within 14 days of stopping an MAO inhibitor unless specifically directed by a healthcare professional. MAO inhibitors can intensify and prolong chlorpheniramine’s effects.

Alcohol and other sedating medicines. Alcohol, sedatives, sleep medicines, opioids, other antihistamines, and other CNS depressing medicines may increase drowsiness and impair coordination when combined with chlorpheniramine.

Tell your doctor or pharmacist about all medicines you’re taking.

Contraindications

Hypersensitivity to chlorpheniramine or its components. Narrow angle glaucoma, where specified by the product labeling.

When to Seek Medical Help

Contact a doctor promptly, or seek emergency care or poison control, for a severe allergic reaction, severe difficulty breathing, severe confusion or extreme drowsiness, inability to urinate, or serious symptoms after taking more than the recommended amount.

Pregnancy, Breastfeeding, Liver, and Kidney Considerations

• Pregnancy. Chlorpheniramine can be used during pregnancy when recommended by a doctor or pharmacist. Because it can cause drowsiness, a less sedating antihistamine may sometimes be preferred. Discuss regular or prolonged use with a healthcare professional.
• Breastfeeding. Chlorpheniramine can be used in some breastfeeding patients, particularly for short term or occasional use, but it may cause sleepiness in the baby. A less sedating antihistamine may sometimes be preferred. Discuss regular use with a doctor or pharmacist and monitor the infant for unusual sleepiness or feeding problems.
• Liver and kidney disease. Tell your doctor or pharmacist if you have liver or kidney disease, as chlorpheniramine may require additional caution or product specific dosing advice.

Popular Brands of Chlorpheniramine

India, Piriton.

US, Chlor-Trimeton.

Brand availability, strengths, formulations, and ingredients may vary by country. Some products combine chlorpheniramine with other medicines.

Approximate Price in India

Piriton 4 mg tablet costs approximately 39 rupees per 10 tablet pack, with an MRP around 48 rupees for the listed pack.

Prices may vary depending on the brand, strength, pack size, pharmacy, location, availability, and discounts. This is an approximate price for the specified product and pack, not a universal price for all chlorpheniramine products.

How We Can Help

If your allergy symptoms are frequent, severe, or not improving, a qualified doctor can assess your symptoms and recommend an appropriate treatment. HealthPil can connect you with a qualified doctor for an online consultation.