Terfenadine

Description

Terfenadine is an effective antihistamine medicine used for the treatment of allergic reactions such as sneezing, runny nose, itching, throat irritation, watery eyes, and hay fever or urticaria caused by pollen, dust, or animal hair.

Side effects

Major & minor side effects for Terfenadine

  • Nausea and vomiting
  • Abdominal pain
  • Diarrhea
  • Tiredness
  • Chest pain
  • Headache
  • Dizziness
  • Increased blood pressure
  • Decreased heartbeat
  • Dry mouth
  • Chills
  • Cough

Uses of Terfenadine

What is it prescribed for?

  • Allergic reactions
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Concerns

Commonly asked questions

  • Onset of action
    The effect of this medicine can be observed within 1-2 hours of oral administration.
  • Duration of effect
    The effect of this medicine lasts for an average duration of 12-14 hours.
  • Safe with alcohol?
    Interaction with alcohol is unknown. It is advisable to consult your doctor before consumption.
  • Is it habit forming?
    No habit-forming tendencies were reported.
  • Usage in pregnancy?
    This medicine is not recommended for use in pregnant women unless necessary. The risks and benefits should be discussed with the doctor before taking this medicine.
  • Usage while breast-feeding?
    This medicine is not recommended for use in breastfeeding women unless necessary. The risks and benefits should be discussed with the doctor before taking this medicine.

Allergy

This medicine is not recommended for use if you have a known allergy to terfenadine or any other ingredients present along with it.

Porphyria

This medicine is not recommended for use in patients with porphyria (a disorder that results from the buildup of porphyrin in the body) due to the risk of worsening of the patient's condition.
Warnings for special population

Pregnancy

This medicine is not recommended for use in pregnant women unless necessary. The risks and benefits should be discussed with the doctor before taking this medicine.

Breast-feeding

This medicine is not recommended for use in breastfeeding women unless necessary. The risks and benefits should be discussed with the doctor before taking this medicine.
General warnings

Driving or operating machinery

Use of this medicine may cause tiredness, fatigue, or dizziness in some patients. It is advised that you do not perform any activities such as driving a vehicle or operating machinery if you experience any of these symptoms during treatment with this medicine.

Kidney impairment

This medicine should be used with caution in patients suffering from kidney diseases due to the increased risk of severe adverse effects. Close monitoring of kidney function tests is necessary while receiving this medicine. Appropriate dose adjustments or replacement with a suitable alternative may be required in some cases based on the clinical condition.

Liver impairment

This medicine should be used with caution in patients with liver impairment due to increased risk of severe side effects or worsening of the patient's condition. Close monitoring of liver function tests, appropriate dose adjustments, or replacement with a suitable alternative may be necessary based on the clinical condition of the patient.

Heart diseases

This medicine should be used with caution in patients with heart diseases due to increased risk of severe side effects or worsening of the patient's condition. Close monitoring of heart function is necessary while taking this medicine or replacement with a suitable alternative may be necessary based on the clinical condition of the patient

Use in elderly population

This medicine should be used with caution in individuals who are 60 years old and above due to an increased risk of side effects. Close monitoring of the clinical condition, appropriate dose adjustments, or replacement with a suitable alternative may be necessary based on the clinical condition of the patient.

QT prolongation

This medicine may cause prolongation of the QT interval and worsen the patient's condition. Appropriate corrective measures, dose adjustments or replacement with a suitable alternative may be required in some cases based on the clinical condition.

Missed Dose

The missed dose should be taken as soon as possible. It is advisable to skip the missed dose if it is already time for your next scheduled dose. Do not use extra medicine to make up for the missed dose.

Overdose

Seek emergency medical treatment or contact the doctor in case of an overdose.
All drugs interact differently for person to person. You should check all the possible interactions with your doctor before starting any medicine.
Interaction with Alcohol

Description

Interaction with alcohol is unknown. It is advisable to consult your doctor before consumption.

Instructions

Interaction with alcohol is unknown. It is advisable to consult your doctor before consumption.
Interaction with Medicine

Amitriptyline

Ciprofloxacin

Amiodarone

Dronedarone

Disease interactions

Disease

Information not available.
Food interactions
Information not available.
Lab interactions
Information not available.
Take this medicine before or after food, exactly as instructed by the doctor. Do not take in larger or smaller amounts than prescribed. Seek emergency medical treatment in case of any severe side effects. Ensure that the course of treatment is completed. Do not stop the use of this medicine without consulting your doctor.
Miscelleneous

To be taken before food

To be taken as instructed by doctor

May cause sleepiness

How it works
This medicine works by reducing a chemical substance called histamine from the body.
Legal Status

Approved

Unknown

Unknown

Unknown

Classification

Category

Antihistamines

Schedule

Schedule H

[Internet]. Drugbank.ca. 2018 [cited 20 December 2018]. Available from:

https://www.drugbank.ca/drugs/DB00342

[Internet]. Pubchem.ncbi.nlm.nih.gov. 2018 [cited 20 December 2018]. Available from:

https://pubchem.ncbi.nlm.nih.gov/compound/terfenadine#section=General-MS

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Information on this page was last updated on 4 Jun 2019

Disclaimer

We’ve made all possible efforts to ensure that the information provided here is accurate, up-to-date and complete, however, it should not be treated as a substitute for professional medical advice, diagnosis or treatment. Practo only provides reference source for common information on medicines and does not guarantee its accuracy or exhaustiveness. The absence of a warning for any drug or combination thereof, should not be assumed to indicate that the drug or combination is safe, effective, or appropriate for any given patient. Practo does not assume any responsibility for any aspect of healthcare administered with the aid of information provided above. If you have any doubts about your medication then we strongly recommend that you consult with your doctor, nurse or healthcare provider. See detailed T&C here.