Terfenadine
Uses of Terfenadine
Terfenadine is primarily used for the relief of symptoms associated with seasonal allergic rhinitis, commonly known as hay fever, and falls under the class of antihistamine medications.
It is also used to manage other allergic conditions such as skin allergies, hives (urticaria), and allergic reactions to insect bites.
Side effects of Terfenadine
Drowsiness
Fatigue
Headache
Nausea
Vomiting
How Terfenadine works
Terfenadine is a type of medicine known as an antihistamine. It works by selectively blocking histamine H1-receptors, which are the sites in your body where histamine, a substance released during an allergic reaction, acts. By blocking these receptors, Terfenadine prevents the actions of histamine, thereby reducing symptoms like itching, sneezing, runny nose, and hives that are usually caused by the release of histamine in your body during an allergic response.
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Expert Advice
Dosage Forms Available
Terfenadine is typically available in the form of oral tablets for administration.
Age and Dose Restrictions
This medicine is primarily meant for use in adults of age above 18 years.
Contraindications
This medicine is contraindicated in patients with known hypersensitivity to Terfenadine.
It is also contraindicated in patients with liver impairment or a history of heart disease and rhythm disorders.
Other Medications to Avoid
Terfenadine can interact with certain kinds of medicines, including antibiotics (such as erythromycin), antifungals (like ketoconazole and itraconazole), and antiarrhythmics (such as quinidine and sotalol).
Overdose and Missed Dose
An overdose of Terfenadine can cause symptoms like dizziness, drowsiness, headache, nausea, and vomiting. In severe cases, it may cause heart rhythm disturbances. Seek immediate medical attention in case of a suspected overdose.
If you forget to take your dose of Terfenadine, take it as soon as you remember. However, if it is near the time for your next dose, skip the missed dose and resume your regular dosing schedule.
Management of Side Effects
Most side effects of Terfenadine are temporary and generally harmless and resolve when discontinuing this medicine. However, if you experience any severe side effects or worsening of any symptoms, please consult your doctor.
To manage drowsiness or fatigue, avoid taking this medicine when you need to stay awake or need full alertness.
To manage dry mouth, keep yourself properly hydrated by drinking enough water.
Use in Driving and Operating Machinery
This medicine may cause drowsiness or dizziness that may affect your ability to drive or operate heavy machinery. Avoid these activities if you experience these symptoms after taking Terfenadine.
Use in Pregnancy and Lactation
It is advised to consult your doctor before using Terfenadine during pregnancy or while breastfeeding.
Caution in Other Conditions
Patients with kidney disease should exercise caution when taking this medicine. Similarly, individuals with electrolyte imbalances should also consult their doctor before starting Terfenadine.
Special Dietary and Lifestyle Recommendations
Avoid grapefruit and grapefruit juice as they can increase the levels of Terfenadine in the body, which can lead to an increased risk of side effects.
Ensure you get adequate rest to manage potential drowsiness or fatigue caused by this medicine.
Maintain good personal hygiene to avoid allergens that can trigger allergic reactions.
Frequently asked questions
Can Terfenadine cause drowsiness?
Yes, drowsiness or fatigue is one of the common side effects of Terfenadine. If it causes drowsiness or dizziness, you should avoid driving or operating machinery until you know how it affects you.
Is Terfenadine discontinued?
Yes, Terfenadine has largely been replaced by newer antihistamines that do not carry the same risk of heart problems. It was withdrawn from the U.S. market in 1998 due to safety concerns.
Does Terfenadine have any effect on the menstrual cycle?
Terfenadine, an antihistamine that was used to treat allergies, does not directly affect the menstrual cycle.
Is Terfenadine a steroid?
No, Terfenadine is not a steroid. It is an antihistamine, which is a class of medications used to manage allergies.
Will Terfenadine affect fertility?
Terfenadine is not directly associated with affecting fertility. However, individual reactions can vary, and it is recommended to consult your doctor if you plan to conceive while taking this medicine.
Is it safe to take Terfenadine daily?
It is acceptable to take Terfenadine daily as long as it is prescribed by your doctor and you adhere strictly to the prescribed dose.
How much time does Terfenadine take to work?
Terfenadine works relatively quickly after intake, but the exact timeframe can vary depending on individual factors like metabolism and severity of symptoms.
List of Medicines for Terfenadine
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