Why is this medication prescribed?

Clemastine is prescribed primarily for its antihistamine properties to relieve symptoms associated with allergic conditions such as hay fever, allergic rhinitis, and allergic skin conditions like hives (urticaria). It works by blocking the action of histamine, a substance in the body that causes allergic symptoms.

How should this medicine be used?

Here’s how Clemastine should typically be used:

• Dosage: The dosage of Clemastine varies depending on the condition being treated and the age of the patient. It is usually taken orally in tablet form.
• Frequency: It is often taken 1 to 3 times daily as directed by your doctor.
• Instructions: Follow the instructions provided by your doctor or pharmacist carefully. Do not take more or less of it or take it more often than prescribed.
• Administration: Clemastine can be taken with or without food. Swallow the tablet whole with a full glass of water.
• Duration: Continue taking Clemastine for the duration prescribed by your doctor, even if you start to feel better. Stopping medication early may allow symptoms to return.
• Special Instructions: If you miss a dose, take it as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not double up to make up for a missed dose.
• Consultation: Always consult your doctor if you have any questions or concerns about using Clemastine.

It’s important to note that Clemastine may cause drowsiness or dizziness. Avoid driving or operating machinery until you know how Clemastine affects you. Avoid alcohol while taking Clemastine as it can increase drowsiness.

If you experience any severe side effects or have concerns about Clemastine, contact your healthcare provider promptly.

Other uses for this medicine

• Treatment of Motion Sickness: Clemastine has been used to alleviate symptoms of motion sickness, particularly nausea and vomiting.
• Management of Itching: It can be prescribed to relieve itching associated with various skin conditions, although this use is less common compared to newer antihistamines.
• As an Anticholinergic: Due to its anticholinergic properties, Clemastine may be used to manage symptoms such as urinary frequency and urgency in conditions like overactive bladder.
• Experimental Uses: There is ongoing research into potential neuroprotective effects of Clemastine in conditions like multiple sclerosis (MS), though this is still investigational.

What special precautions should I follow?

Regarding special precautions for using Clemastine:

• Medical History: Inform your doctor about any medical conditions you have, especially asthma, glaucoma, high blood pressure, hyperthyroidism, seizures, stomach or intestinal problems, and difficulty urinating due to an enlarged prostate gland.
• Pregnancy and Breastfeeding: Clemastine should be used with caution during pregnancy, especially during the first trimester, and while breastfeeding. Consult your doctor for guidance.
• Interactions: Clemastine can interact with other medications, including sedatives, tranquilizers, muscle relaxants, and other antihistamines. It’s essential to inform your doctor about all medications, vitamins, and supplements you are taking.
• Driving and Machinery: Due to its potential to cause drowsiness or dizziness, avoid activities requiring mental alertness such as driving or operating machinery until you know how Clemastine affects you.
• Alcohol: Avoid consuming alcohol while taking Clemastine, as it can increase drowsiness and other side effects.
• Dosage: Follow the dosage instructions provided by your doctor carefully. Taking more than the prescribed dose can lead to serious side effects.
• Allergic Reactions: If you have had an allergic reaction to Clemastine or any similar medications in the past, inform your doctor.

Always consult your healthcare provider for specific advice tailored to your medical condition and needs before starting or stopping any medication, including Clemastine.

What special dietary instructions should I follow?

There are generally no specific dietary restrictions associated with Clemastine. However, it’s always advisable to maintain a balanced diet and avoid excessive consumption of alcohol or foods that may exacerbate allergies or sensitivities.

What should I do if I forget a dose?

If you miss a dose of Clemastine, take it as soon as you remember. However, if it is almost time for your next 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.

What side effects can this medication cause?

Clemastine, like any medication, can cause side effects. Some common side effects include:

• Drowsiness: This is one of the most common side effects of Clemastine. It may impair your ability to concentrate or perform tasks that require alertness.
• Dry mouth: Clemastine can reduce saliva production, leading to a dry sensation in the mouth.
• Dizziness: Some people may experience dizziness or lightheadedness while taking Clemastine.
• Blurred vision: Clemastine can temporarily affect vision, causing blurred vision or difficulty focusing.
• Constipation: It may cause constipation in some individuals.
• Difficulty urinating: Clemastine can sometimes make it harder to urinate, especially in men with an enlarged prostate.
• Nausea: Some people may experience nausea or stomach discomfort.
• Headache: Headaches can occur as a side effect of Clemastine.
• Nervousness or irritability: In some cases, Clemastine may cause nervousness or irritability.
• Fatigue: Feeling tired or fatigued is another possible side effect.

Less commonly, Clemastine may cause more serious side effects such as:

• Allergic reactions (rash, itching, swelling of the face/tongue/throat)
• Trouble breathing
• Fast or irregular heartbeat
• Chest pain
• Mental/mood changes (such as confusion, hallucinations)
• Difficulty sleeping (insomnia)

If you experience any severe side effects or allergic reactions while taking Clemastine, seek immediate medical attention. It’s important to discuss any concerns or unusual symptoms with your healthcare provider.

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

Storage and Disposal:

• Storage: Store Clemastine tablets at room temperature away from light and moisture. Avoid storing it in the bathroom. Keep it out of reach of children and pets.
• Disposal: Dispose of unused or expired Clemastine tablets according to local guidelines and regulations. Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Proper disposal helps prevent accidental ingestion by pets and children.

In case of emergency/overdose

• Emergency: If someone collapses or has trouble breathing after taking Clemastine, call emergency services immediately.
• Overdose Symptoms: Symptoms of Clemastine overdose may include extreme drowsiness, confusion, hallucinations, seizures, fast/irregular heartbeat, and fainting.
• What to Do: If you suspect an overdose or experience severe symptoms, contact your local poison control center (1-800-222-1222 in the United States) or emergency room right away. Provide them with as much information as possible, including the amount of Clemastine taken and the time it was ingested.

What other information should I know?

• Follow Instructions: Take Clemastine exactly as prescribed by your doctor. Do not adjust the dosage or stop taking it without consulting your healthcare provider.
• Regular Monitoring: Your doctor may need to monitor your response to Clemastine and adjust your dosage accordingly.
• Allergies: Inform healthcare providers about any allergies you have, especially to antihistamines or other medications.
• Medical Tests: Clemastine may interfere with allergy skin tests. Inform your doctor if you are scheduled to undergo any allergy testing.
• Consultation: Always consult your doctor or pharmacist if you have any questions or concerns about Clemastine or its use.

By following these guidelines and being aware of the potential risks and proper usage of Clemastine, you can ensure safer and more effective management of your allergy symptoms.