Why is this medication prescribed?

Clemastine is an antihistamine medication that is prescribed to relieve symptoms associated with allergies and allergic reactions. It is commonly used to treat conditions such as:

• Allergic rhinitis: Clemastine can help alleviate symptoms like sneezing, runny or itchy nose, and itchy or watery eyes caused by allergies to pollen, dust mites, pet dander, or other environmental allergens.
• Allergic conjunctivitis: It can also be used to relieve itching and redness of the eyes due to allergic reactions.
• Skin allergies: Clemastine may be prescribed for conditions like urticaria (hives) or pruritus (itching) caused by allergic skin reactions.
• Insect bites or stings: Clemastine can help reduce itching and swelling caused by insect bites or stings.
• Allergic reactions: In some cases, it may be used as part of the treatment for mild allergic reactions or as a preventive measure before receiving allergenic substances (e.g., before allergy shots).

How should this medicine be used?

The dosing instructions for Clemastine can vary depending on the specific product (e.g., tablets, syrup, or capsules) and the patient’s age. It’s important to follow the doctor’s or pharmacist’s instructions and the dosing information provided on the medication label. However, here are some general guidelines:

• Oral Tablets or Capsules: Clemastine is typically taken by mouth with or without food. The usual adult dose is 1.34 mg (1 tablet or capsule) every 12 hours, but this can vary. Pediatric doses will depend on the child’s age and weight, and it is important to follow the doctor’s recommendations.
• Syrup: For pediatric use, the dosage is typically determined by the child’s age and weight. Follow the doctor’s instructions or the dosing information provided with the product.
• Do not exceed the recommended dose: Taking more Clemastine than prescribed can lead to adverse effects, including drowsiness, dizziness, dry mouth, and urinary retention.
• Avoid alcohol: It’s generally recommended to avoid alcohol while taking Clemastine, as it can intensify drowsiness and impair your ability to function.
• Read the label: Always read and follow the instructions on the medication label or the prescription provided by your healthcare provider.
• Consult your healthcare provider: If you have any questions or concerns about the proper use of Clemastine or if you experience any side effects, contact your healthcare provider for guidance.

It’s important to note that Clemastine may cause drowsiness, so it’s advised to avoid activities that require mental alertness, such as driving or operating heavy machinery, until you know how the medication affects you. If you experience severe drowsiness or any other concerning side effects, seek medical attention immediately.

Other uses for this medicine

Clemastine is primarily an antihistamine for allergy relief, but it may have other off-label uses. Some potential alternative uses of Clemastine include:

• Itch Relief: Clemastine may be used to relieve itching associated with various skin conditions, such as hives or eczema.
• Motion Sickness: In some cases, it may be used to alleviate symptoms of motion sickness, although there are more commonly prescribed medications for this purpose.
• Sleep Aid: Due to its sedative effects, some people may use Clemastine as a sleep aid. However, it’s not recommended for this purpose, and there are better options available.

What special precautions should I follow?

Special precautions to consider when using Clemastine:

• Medical history: Before taking Clemastine, inform your healthcare provider about your complete medical history, especially if you have a history of certain medical conditions, such as glaucoma, asthma, urinary retention, or an enlarged prostate. These conditions may require special monitoring or alternative treatment options.
• Pregnancy and breastfeeding: Consult your healthcare provider if you are pregnant or breastfeeding, as the safety of Clemastine during pregnancy and while nursing is not well-established. They can help you weigh the potential benefits and risks.
• Alcohol and sedation: Avoid alcohol while taking Clemastine, as it can enhance the sedative effects of the medication and increase drowsiness.
• Operating machinery and driving: Clemastine may cause drowsiness, impair coordination, and affect alertness. It’s important to avoid activities that require mental alertness, such as driving or operating heavy machinery, until you know how the medication affects you.
• Other medications: Inform your healthcare provider about all the medications, supplements, and herbal products you are currently taking, as Clemastine may interact with certain drugs. This includes other antihistamines, sedatives, and medications that can cause drowsiness.
• Side effects: Be aware of potential side effects, which may include drowsiness, dizziness, dry mouth, and constipation. If you experience severe or bothersome side effects, consult your healthcare provider.

Always follow your healthcare provider’s instructions and guidance when using Clemastine or any other medication, and do not hesitate to ask questions or seek clarification if you have concerns or questions about its use.

What special dietary instructions should I follow?

There are generally no specific dietary instructions that need to be followed when taking Clemastine. However, here are some general guidelines to consider:

• Food: Clemastine can be taken with or without food, depending on your preference and how it affects your stomach. It is generally well-tolerated with or without food.
• Grapefruit: Some medications can interact with grapefruit and grapefruit juice, potentially affecting how the medication is absorbed or metabolized in the body. However, there is no specific information suggesting that Clemastine interacts with grapefruit. Nevertheless, it’s always a good idea to consult with your healthcare provider or pharmacist if you have concerns about interactions with specific foods.

What should I do if I forget a dose?

If you forget to take a dose of Clemastine, take it as soon as you remember. However, if it is close to the 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, as this can increase the risk of side effects.

What side effects can this medication cause?

Clemastine, like many medications, can cause side effects. These side effects can vary from person to person, and some individuals may experience no side effects at all. Common side effects of Clemastine may include:

• Drowsiness: One of the most common side effects of Clemastine is drowsiness or sedation. This can impair your ability to concentrate and perform activities that require mental alertness, such as driving or operating heavy machinery.
• Dizziness: Some people may experience dizziness while taking Clemastine.
• Dry mouth: Clemastine can cause a dry mouth, which may lead to discomfort.
• Constipation: Constipation can occur as a side effect of Clemastine.
• Blurred vision: Some individuals may experience blurred vision or difficulty focusing while taking the medication.
• Urinary retention: In some cases, Clemastine can lead to difficulty emptying the bladder, especially in individuals with pre-existing urinary issues.
• Increased heart rate: A rapid heart rate (tachycardia) can occur as a side effect in some people.
• Nausea and gastrointestinal discomfort: Some individuals may experience gastrointestinal symptoms such as nausea, stomach upset, or diarrhea.
• Difficulty sleeping: Although Clemastine is often used for its sedative properties, it can occasionally lead to difficulty falling asleep or staying asleep in some individuals.
• Allergic reactions: While rare, allergic reactions to Clemastine can occur. Seek immediate medical attention if you experience symptoms like hives, rash, itching, swelling of the face or throat, severe dizziness, or difficulty breathing.

It’s important to note that these side effects are not experienced by everyone, and some individuals may tolerate Clemastine well without significant adverse effects. If you experience severe or bothersome side effects, or if they persist or worsen over time, contact your healthcare provider for guidance. Additionally, it’s crucial to follow your healthcare provider’s recommended dosage and usage instructions to minimize the risk of side effects.

If you have concerns about Clemastine or its side effects, or if you are experiencing severe or unusual symptoms, consult with your healthcare provider. They can help assess whether Clemastine is the right medication for your condition and whether adjustments to your treatment plan are necessary.

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

Storage of Clemastine:

• Store Clemastine according to the instructions on the medication label or as directed by your pharmacist or healthcare provider. In general, it should be stored at room temperature, away from excessive heat, light, and moisture.
• Keep Clemastine out of reach of children and pets. Ensure that the medication is stored in a secure location.
• Do not use Clemastine if it has passed its expiration date. Expired medications may not be as effective and can potentially be harmful.

Disposal of Clemastine:

• Dispose of any unused or expired Clemastine safely. Do not flush it down the toilet or pour it down the drain unless specifically instructed to do so.
• The best way to dispose of medication is through a medication take-back program. Many pharmacies and healthcare facilities offer safe disposal options for expired or unwanted medications.
• If a take-back program is not available in your area, you can mix the medication with an undesirable substance (e.g., coffee grounds or cat litter) in a sealed plastic bag and throw it in the household trash. This helps prevent accidental ingestion by children or pets.

In case of emergency/overdose

If you suspect an overdose of Clemastine or if someone has ingested more than the prescribed amount, seek immediate medical attention or contact a poison control center. Symptoms of Clemastine overdose may include:

• Extreme drowsiness or sedation
• Confusion
• Hallucinations
• Rapid heartbeat
• Flushing
• Tremors
• Seizures
• Difficulty breathing

What other information should I know

• It’s important to inform your healthcare provider about all the medications, supplements, and herbal products you are taking before starting Clemastine to check for potential drug interactions.
• Avoid consuming alcohol while taking Clemastine, as it can increase drowsiness and impair your ability to function.
• Clemastine can make you drowsy, so use caution when engaging in activities that require mental alertness, such as driving or operating heavy machinery, until you know how the medication affects you.
• If you have any questions or concerns about Clemastine or its use, consult your healthcare provider or pharmacist. They can provide you with personalized guidance and address any specific issues you may have.

Always follow your healthcare provider’s instructions for the proper use of Clemastine and any other medications, and do not hesitate to seek medical help or advice in case of emergencies or if you have any doubts or questions about your treatment.