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Brexin L.A. (Generic Chlorpheniramine)

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Why is this medication prescribed?

Chlorpheniramine is an antihistamine medication commonly prescribed to relieve symptoms of allergies, such as sneezing, itching, watery eyes, and runny nose. It works by blocking the effects of histamine, a substance produced by the body during allergic reactions.

Chlorpheniramine can also be used to alleviate symptoms of the common cold, hay fever, and other respiratory allergies. Additionally, it may be included in some combination medications for cough and cold relief.

How should this medicine be used?

Chlorpheniramine is an antihistamine medication commonly used to relieve symptoms of allergies such as sneezing, itching, watery eyes, and runny nose. It’s essential to use chlorpheniramine precisely as directed by your healthcare provider or as indicated on the medication label. Here are some general guidelines:

  • Dosage: Follow your healthcare provider’s instructions regarding the dosage. The dosage may vary depending on factors such as age, weight, and the condition being treated.
  • Administration: Chlorpheniramine is typically taken orally with water. It may be taken with or without food, but it’s essential to be consistent.
  • Timing: Take chlorpheniramine at the same time(s) each day to maintain a consistent level of the drug in your body.
  • Do not exceed the recommended dose: Taking more than the recommended dose can increase the risk of side effects without providing additional benefits.
  • Avoid alcohol: Drinking alcohol while taking chlorpheniramine can increase drowsiness and other side effects.
  • Be cautious with other medications: Inform your healthcare provider about all the medications you are currently taking, including prescription and over-the-counter drugs, as well as any herbal supplements. Some medications may interact with chlorpheniramine, increasing the risk of side effects or reducing its effectiveness.
  • Do not stop taking chlorpheniramine suddenly: If you have been taking chlorpheniramine regularly and want to stop, consult your healthcare provider. They may recommend gradually reducing the dose to avoid withdrawal symptoms.
  • Store properly: Keep chlorpheniramine in its original container, tightly closed, and out of reach of children. Store it at room temperature away from moisture and heat.
  • Read the label: Always read the medication label and package insert carefully for specific instructions and any warnings or precautions.
  • Seek medical attention if necessary: If you experience severe side effects or an allergic reaction (such as difficulty breathing, swelling of the face, lips, tongue, or throat), seek medical attention immediately.

Remember, these are general guidelines. Always consult your healthcare provider for personalized advice on how to use chlorpheniramine safely and effectively.

Other uses for this medicine

Aside from its primary use in treating allergy symptoms, chlorpheniramine may also be used for other purposes under the guidance of a healthcare professional. These alternative uses might include relieving symptoms of motion sickness, treating nausea and vomiting, managing vertigo (dizziness), or assisting with mild cases of insomnia due to its sedative effects. However, it’s crucial to use chlorpheniramine only as directed by a healthcare provider and to discuss any off-label uses with them beforehand.

What special precautions should I follow?

When using chlorpheniramine, there are several special precautions to keep in mind:

  • Allergic Reactions: Inform your healthcare provider if you have had any allergic reactions to chlorpheniramine or any other medications in the past. Also, disclose any allergies to foods, dyes, preservatives, or other substances.
  • Medical Conditions: Inform your healthcare provider about any medical conditions you have, especially asthma, glaucoma, enlarged prostate, urinary retention, peptic ulcer disease, high blood pressure, heart disease, thyroid disorders, liver disease, or kidney disease. Chlorpheniramine may exacerbate certain medical conditions or interact with other medications.
  • Pregnancy and Breastfeeding: If you are pregnant or breastfeeding, consult your healthcare provider before using chlorpheniramine. While it’s generally considered safe to use during pregnancy and breastfeeding when used as directed, it’s essential to discuss potential risks and benefits with your healthcare provider.
  • Children and Elderly: Use caution when administering chlorpheniramine to children or elderly individuals, as they may be more susceptible to its side effects, such as drowsiness or confusion.
  • Driving and Operating Machinery: Chlorpheniramine can cause drowsiness and impair your ability to concentrate and react quickly. Avoid driving or operating heavy machinery until you know how chlorpheniramine affects you.
  • Alcohol and Sedatives: Avoid consuming alcohol or taking other medications with sedative effects while using chlorpheniramine, as this can increase drowsiness and impair coordination.
  • Interactions with Other Medications: Inform your healthcare provider about all the medications you are taking, including prescription drugs, over-the-counter medications, herbal supplements, and vitamins, to avoid potential drug interactions.

Always follow your healthcare provider’s recommendations and the instructions on the medication label carefully to ensure safe and effective use of chlorpheniramine. If you have any questions or concerns, don’t hesitate to consult your healthcare provider or pharmacist for guidance.

What special dietary instructions should I follow?

Regarding dietary instructions, there are no specific dietary restrictions associated with chlorpheniramine. However, it’s essential to maintain a balanced diet and stay hydrated while taking any medication.

What should I do if I forget a dose?

If you forget to take a dose of chlorpheniramine, take it as soon as you remember. However, if it’s almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to catch up. If you’re unsure about what to do, consult your healthcare provider or pharmacist for guidance.

What side effects can this medication cause?

Chlorpheniramine, like any medication, can cause side effects, although not everyone experiences them. Common side effects of chlorpheniramine may include:

  • Drowsiness or sedation
  • Dry mouth
  • Blurred vision
  • Constipation
  • Dizziness
  • Difficulty urinating
  • Nausea or upset stomach
  • Headache
  • Increased appetite or weight gain
  • Nervousness or restlessness (especially in children)

These side effects are usually mild and temporary. However, if any of these side effects persist or worsen, or if you experience any other unusual symptoms, it’s essential to contact your healthcare provider.

In some cases, chlorpheniramine may cause more severe side effects that require immediate medical attention. These can include:

  • Allergic reactions, such as rash, itching, swelling, severe dizziness, or trouble breathing
  • Fast or irregular heartbeat
  • Trouble sleeping or insomnia
  • Confusion or hallucinations
  • Difficulty concentrating or memory problems
  • Severe dizziness or fainting
  • Severe stomach pain or vomiting
  • Difficulty urinating or changes in urination pattern
  • Yellowing of the skin or eyes (jaundice)
  • Unusual bleeding or bruising

If you experience any severe or concerning side effects while taking chlorpheniramine, seek medical attention immediately. It’s also crucial to report any side effects to your healthcare provider or pharmacist, as they can help determine the best course of action and may suggest alternative treatments if necessary.

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

When it comes to the storage and disposal of chlorpheniramine, here’s what you should know:


  • Store chlorpheniramine at room temperature away from moisture and heat.
  • Keep the medication out of reach of children and pets.
  • Do not store chlorpheniramine in the bathroom or near the kitchen sink where it could be exposed to moisture.
  • Store chlorpheniramine in its original packaging or container to protect it from light and moisture.
  • Follow any specific storage instructions provided by your pharmacist or healthcare provider.


  • Dispose of expired or unused chlorpheniramine safely to prevent accidental ingestion by children, pets, or others.
  • Follow any specific disposal instructions provided by your pharmacist or healthcare provider.
  • Do not flush chlorpheniramine down the toilet or pour it down the drain unless instructed to do so.
  • You can check with your local pharmacy or municipality for medication disposal programs or guidelines.

In case of emergency/overdose

  • Call emergency services (such as 911 in the United States) immediately if you suspect an overdose or if someone has collapsed or is not breathing.
  • If the person is conscious, call Poison Control at 1-800-222-1222 for guidance on what to do next.
  • Provide as much information as possible about the type and amount of chlorpheniramine ingested, as well as any other medications or substances taken.
  • Follow the instructions provided by emergency services or Poison Control.

What other information should I know?

  • Keep all appointments with your healthcare provider while taking chlorpheniramine.
  • Inform your healthcare provider if your symptoms do not improve or worsen while taking chlorpheniramine.
  • Avoid driving or operating heavy machinery until you know how chlorpheniramine affects you, as it may cause drowsiness or dizziness.
  • Do not take chlorpheniramine with alcohol or other medications that cause drowsiness, as it can increase the risk of side effects.
  • If you have any questions or concerns about chlorpheniramine, consult your healthcare provider or pharmacist for guidance.

Always consult your healthcare provider or pharmacist if you have any questions or concerns about brexanolone injection or its use.

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