Astemizole
About Astemizole
Astemizole is an oral antihistamine used to relieve allergy symptoms such as a runny nose, sneezing, itchy eyes, and chronic hives. It helps block histamine, a natural substance your body releases during an allergic reaction that triggers swelling and inflammation. This medicine is designed to offer long-lasting relief from these uncomfortable seasonal and year-round symptoms.
To get the best results, you must take this medicine consistently. It is usually taken once a day, and you should always take it on an empty stomach, either one hour before or two hours after a meal, because food can significantly lower how much of the medicine your body absorbs. Making simple lifestyle adjustments, such as keeping your windows closed during high-pollen seasons and using an air purifier, can also help improve your allergy symptoms.
While taking Astemizole, some people may experience mild side effects like an increased appetite or a dry mouth. However, you must consult your doctor immediately if you experience serious side effects, particularly an irregular or racing heartbeat, severe dizziness, or fainting.
Do not take this if you have a pre-existing heart condition, liver damage, or a history of abnormal heart rhythms. It is crucial to discuss your complete medical history with your healthcare provider before starting this medication to ensure it is safe for you, as certain pre-existing conditions can increase the risk of serious side effects.
This medicine can interact dangerously with several other medications, including certain common antifungals and antibiotics, which can lead to severe heart rhythm problems. Avoid drinking alcohol or smoking while using this treatment, and always consult your doctor if you are pregnant, planning to breastfeed, or managing health conditions as an older adult.
Uses of Astemizole
Medicinal Benefits
Astemizole helps control the symptoms of allergic conditions, making it easier to breathe comfortably and carry on with your daily routine.
Benefits may include:
- Helps relieve sneezing, a runny nose, and nasal itching caused by allergies.
- Reduces itchy, watery, and red eyes associated with allergic reactions.
- Improves itching and swelling caused by hives.
- Supports long-lasting relief from allergy symptoms.
- Promotes better sleep by reducing allergy-related discomfort.
- Improves overall comfort and quality of life during allergy flare-ups.
Directions for Use
- Take the tablet on an empty stomach, either 1 hour before eating or 2 hours after a meal.
- Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet.
- Take your dose at the same time every day to maintain a steady level of the medicine in your body.
- Never adjust your dose or stop taking this medication without first consulting your doctor. Always follow their exact instructions.
Storage
Side Effects of Astemizole
Common Side Effects (Usually mild):
- Increased appetite
- Weight gain
- Dry mouth
- Mild drowsiness or fatigue
Serious Side Effects (Call a doctor right away):
- A fast, pounding, or irregular heartbeat
- Severe dizziness or feeling like you might pass out
- Signs of a serious allergic reaction, such as swelling of the face, lips, tongue, or throat, or difficulty breathing
- Unexplained shortness of breath or chest discomfort
Drug Warnings
- Monitor your heart rhythm: Pay close attention to your heartbeat. If you ever feel your heart racing, fluttering, or skipping a beat, stop taking the medicine and seek medical help immediately.
- Review your other medications: Always show your doctor or pharmacist a complete list of all prescription and over-the-counter drugs you take, as certain combinations can be highly dangerous.
- Assess your alertness: Though this medicine is designed not to cause drowsiness, do not drive or operate heavy machinery until you know exactly how it affects you.
- Do not share this medicine: This medication is prescribed solely for your specific medical profile. Sharing it with others can put them at risk of severe heart complications.
- Use in children only when prescribed: This medicine should only be given to children if prescribed by a healthcare provider. The doctor may adjust the dose depending on the child's age and body weight.
- Extra care for older adults: Older adults may be more likely to develop heart rhythm problems or take medicines that interact with this medicine. Regular medical supervision may be needed during treatment.
Drug Interactions
- Antifungals (e.g., ketoconazole, itraconazole): These medications stop your body from breaking down Astemizole, which can lead to toxic build-ups and increase the risk of QT interval prolongation (a change in the heart's electrical timing that makes dangerous abnormal heart rhythms more likely) and other serious heart rhythm problems.
- Macrolide antibiotics (e.g., erythromycin, clarithromycin): These can significantly increase the levels of Astemizole in your blood, increasing the risk of serious cardiac side effects.
- Certain antidepressants (e.g., nefazodone): Nefazodone can raise the concentration of Astemizole in your system and affect the electrical activity of your heart.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
unsafeAlcohol may worsen the health condition. So, do not take alcohol while using Astemizole.
Pregnancy
cautionAstemizole is a category C medicine. It may cause toxic effects to the fetus. It should be used in pregnant women only if needed. Please consult your doctor. Your doctor will weigh the benefits and any potential risks before prescribing it to you.
Breast Feeding
cautionDo not use Astemizole in breastfeeding mothers unless prescribed by your doctor. Your doctor will weigh the benefits and any potential risks before prescribing it to you. Please consult your doctor.
Driving
cautionAstemizole may not cause drowsiness. However, refrain from driving or operating heavy machinery while taking this medicine.
Liver
cautionAstemizole to be taken with caution, especially if you have a history of Liver diseases/conditions. The dose may have to be adjusted by your doctor.
Kidney
cautionAstemizole to be taken with caution, especially if you have a history of Kidney diseases/conditions. The dose may have to be adjusted by your doctor.
Children
cautionFor children above 12 years of age, dose adjustments may be necessary if prescribed.
Habit Forming
Diet & Lifestyle Advise
- Strictly time your meals: Always wait at least 1 hour after taking your medication before eating, or take it 2 hours after a meal, to ensure the drug is absorbed properly.
- Avoid grapefruit and grapefruit juice: Grapefruit contains compounds that block your liver from breaking down this medicine, which can cause the drug to build up to dangerous levels in your body.
- Manage your appetite: Because this medicine can increase your appetite, focus on high-fiber, nutrient-dense foods like vegetables and whole grains to help manage your weight.
- Minimise allergen exposure: Keep your home windows closed during high-pollen seasons, wash your bedding weekly in hot water, and vacuum regularly to reduce the allergen load in your environment.
Special Advise
- Please take Astemizole as long as the doctor prescribed it. Exceeding the recommended dose of Astemizole causes serious cardiovascular adverse events, including cardiac arrest, QT prolongation and other ventricular arrhythmias and death.
- Patients should be advised not to increase the dose of Astemizole in an attempt to accelerate the onset of action as it may lead to heart problems.
Patients Concern
Disease/Condition Glossary
Allergic rhinitis: It is also called hay fever. It occurs when the immune system responds to foreign elements that are typically not harmful to your body. These foreign elements are known as allergens. Symptoms include itching, watery eyes, swelling around the eyes, runny nose, and sneezing.
Urticaria: It is also called hives. It is characterized by red, itchy and swollen bumps on the skin due to triggers such as food, drugs or other irritants.
FAQs
Astemizole is used in the treatment of allergic rhinitis and urticaria. It is used to treat runny nose, sneezing, itching of the skin, watery eyes.
Astemizole contains Astemizole, which acts as an antihistamine. It works by blocking the action of histamines (the chemicals that cause allergic symptoms), thereby reducing the allergic reaction. It provides quick relief from allergy symptoms.
No, you should not take Astemizole along with high blood pressure (hypertension) medication, as it may further raise your blood pressure. Please inform your doctor if you have high blood pressure before starting this medication. Astemizole is contraindicated in patients with heart problems.
No, Astemizole will not help reduce general fever. It is an antiallergic medication that primarily relieves allergic reactions, including seasonal allergies, commonly known as 'hay fever'.
You are not recommended to stop taking Astemizole without consulting your doctor, as it may worsen the infection or cause recurring symptoms. Therefore, take Astemizole for as long as your doctor has prescribed it, and if you experience any difficulty while taking Astemizole, please consult your doctor.
Astemizole should be used with caution in patients suffering from fits, as it may cause recurring fits. Therefore, please inform your doctor if you have or are at risk of having fits.
Astemizole may not cause drowsiness when taken in recommended doses. However, consult your doctor immediately if you develop any abnormal effects while using this medicine.
Hay fever is an allergy caused by outdoor or indoor allergens, such as pollen, dust mites or tiny flecks of skin and saliva shed by cats, dogs and other animals with fur or feathers (pet dander). It leads to cold-like symptoms (running nose, watery eyes).
No, you should not take Astemizole with food. For the medicine to work properly, take it on an empty stomach, either 1 hour before or 2 hours after you eat. Talk to your doctor or pharmacist if you have trouble scheduling your doses.
It is highly recommended to avoid alcohol while taking Astemizole. Alcohol can compound the risk of side effects like dizziness or lightheadedness. Talk to your doctor or pharmacist if you have questions about your lifestyle habits.
No, you should not take Astemizole if you have a history of heart disease, slow heart rates, or irregular heart rhythms, as it can cause serious cardiac complications. Talk to your doctor to find a safer alternative to allergy treatment.
You must consult your healthcare provider before taking Astemizole if you are pregnant, planning to become pregnant, or breastfeeding. Talk to your doctor to weigh the risks and benefits for you and your baby.
Stop taking the medicine immediately and seek urgent medical attention. An irregular, rapid, or fluttering heartbeat can be a sign of a serious heart rhythm issue. Talk to your doctor right away.
Some common antibiotics, especially macrolides like erythromycin, can cause dangerous interactions when combined with Astemizole. Always talk to your doctor or pharmacist before starting any new medication while taking this drug.
Yes. Because Astemizole has been withdrawn from most countries due to the risk of serious heart rhythm problems, healthcare providers now usually prescribe newer second-generation antihistamines, such as cetirizine, loratadine, or fexofenadine, which have a much better established safety profile for most people. Your doctor can recommend the most suitable option based on your symptoms and medical history.
