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Chlor-Trimeton 12 Hour Allergy (Generic Chlorpheniramine)

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Why is this medication prescribed?

Chlor-Trimeton 12 Hour Allergy is typically prescribed to relieve symptoms of allergies such as sneezing, itching, watery eyes, and runny nose. It contains chlorpheniramine maleate, an antihistamine that works by blocking the action of histamine, a substance in the body that causes allergic symptoms.

How should this medicine be used?

Chlor-Trimeton 12 Hour Allergy is usually taken orally with or without food. Follow the dosage instructions provided by your doctor or those on the medication label carefully. Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet before swallowing, as it may affect the medication’s release mechanism.

Typically, Chlor-Trimeton 12 Hour Allergy is taken every 12 hours as needed for allergy symptoms. However, the exact dosage and frequency may vary depending on your age, medical condition, and response to treatment. Do not exceed the recommended dose or take it more frequently than prescribed by your doctor.

If you have any questions or concerns about how to use Chlor-Trimeton 12 Hour Allergy, do not hesitate to consult your healthcare provider for guidance.

Other uses for this medicine

Chlor-Trimeton 12 Hour Allergy, besides its primary use for allergy symptoms, may also be used for other conditions as directed by your doctor. These may include relieving symptoms of the common cold, itching, and hives. However, it’s crucial to use this medication only as prescribed by your healthcare provider, as misuse or inappropriate use can lead to adverse effects or reduced effectiveness.

What special precautions should I follow?

As for special precautions, here are some key points to consider when using Chlor-Trimeton 12 Hour Allergy:

  • Allergies: Inform your doctor if you have any allergies to chlorpheniramine maleate or any other medications.
  • Medical history: Disclose your medical history, especially if you have a history of certain conditions such as asthma, glaucoma, high blood pressure, heart problems, liver disease, kidney disease, thyroid problems, or difficulty urinating (due to an enlarged prostate gland or other causes).
  • Pregnancy and breastfeeding: If you are pregnant or breastfeeding, consult your doctor before using Chlor-Trimeton 12 Hour Allergy. It’s essential to weigh the potential benefits and risks under the guidance of a healthcare professional.
  • Children: Use caution when giving Chlor-Trimeton 12 Hour Allergy to children, as dosage adjustments may be necessary based on their age and weight. Follow your doctor’s recommendations regarding pediatric use.
  • Driving and operating machinery: Chlorpheniramine may cause drowsiness or dizziness, which can impair your ability to concentrate and react quickly. Avoid driving, operating machinery, or engaging in activities that require alertness until you know how this medication affects you.
  • Alcohol and other sedatives: Avoid consuming alcohol or taking other medications that cause drowsiness while using Chlor-Trimeton 12 Hour Allergy, as it can intensify these effects.
  • Interactions: Inform your doctor about all the medications, vitamins, and herbal supplements you are currently taking to avoid potential drug interactions.
  • Overdose: Do not exceed the recommended dosage of Chlor-Trimeton 12 Hour Allergy, as an overdose can lead to serious side effects. If you suspect an overdose, seek medical attention immediately.

Always consult your healthcare provider for personalized advice and guidance regarding the use of Chlor-Trimeton 12 Hour Allergy, especially if you have specific medical concerns or conditions.

What special dietary instructions should I follow?

Regarding special dietary instructions, there are typically no specific dietary restrictions associated with Chlor-Trimeton 12 Hour Allergy. However, it’s essential to stay hydrated and maintain a balanced diet while taking this medication to support your overall health and well-being.

What should I do if I forget a dose?

If you forget to take a dose of Chlor-Trimeton 12 Hour Allergy, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you have any concerns or questions about missed doses, consult your healthcare provider for guidance.

What side effects can this medication cause?

Chlor-Trimeton 12 Hour Allergy, like any medication, may cause side effects in some individuals. Common side effects of chlorpheniramine maleate, the active ingredient in Chlor-Trimeton 12 Hour Allergy, may include:

  • Drowsiness
  • Dizziness
  • Blurred vision
  • Dry mouth, nose, or throat
  • Constipation
  • Upset stomach
  • Nausea
  • Headache

These side effects are usually mild and temporary. However, if any of these effects persist or worsen, or if you experience any other unusual or severe side effects, contact your doctor or pharmacist promptly.

In rare cases, Chlor-Trimeton 12 Hour Allergy may cause more serious side effects, including:

  • Rapid or irregular heartbeat
  • Difficulty urinating
  • Mood changes (e.g., confusion, hallucinations)
  • Tremors
  • Seizures
  • Trouble breathing

Seek immediate medical attention if you experience any of these severe side effects while taking Chlor-Trimeton 12 Hour Allergy.

It’s important to note that this is not a comprehensive list of side effects. If you have concerns about potential side effects or notice any unusual symptoms while taking Chlor-Trimeton 12 Hour Allergy, consult your healthcare provider for further evaluation and guidance. Additionally, always read the medication label and follow the instructions provided by your doctor or pharmacist.

What should I know about storage and disposal of this medication?

Storage and Disposal:


  • Store Chlor-Trimeton 12 Hour Allergy at room temperature, away from moisture, heat, and light.
  • Keep the medication out of reach of children and pets to prevent accidental ingestion.


  • Dispose of Chlor-Trimeton 12 Hour Allergy properly according to local regulations or guidelines.
  • Do not flush medications down the toilet or pour them into a drain unless instructed to do so.
  • If you have unused or expired medication, consult your pharmacist or local waste disposal company for guidance on safe disposal methods.

In case of emergency/overdose

  • In case of an overdose or emergency, such as severe drowsiness, difficulty breathing, hallucinations, or seizures, seek immediate medical attention or contact a poison control center (in the United States, call 1-800-222-1222).
  • Be prepared to provide information about the amount of medication taken, the time of ingestion, and any symptoms experienced.

What other information should I know?

  • Inform all healthcare providers involved in your care about your use of Chlor-Trimeton 12 Hour Allergy, including doctors, dentists, and pharmacists.
  • Avoid consuming alcohol or other sedatives while taking Chlor-Trimeton 12 Hour Allergy, as it can increase the risk of drowsiness and other side effects.
  • Follow your doctor’s instructions carefully regarding dosage and frequency of use.
  • Keep track of your symptoms and report any changes or concerns to your healthcare provider.
  • If you have any questions or concerns about Chlor-Trimeton 12 Hour Allergy or its use, consult your doctor or pharmacist for guidance.

By following these guidelines, you can safely store, use, and dispose of Chlor-Trimeton 12 Hour Allergy and be prepared to handle any emergencies or overdoses effectively.

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