Terbinafine, a brand name for a formulation containing essential Terbinafine, is widely used for various health benefits. This guide provides comprehensive information on the uses, dosage, side effects, and mechanism of action of Terbinafine, as well as insights into how long it takes to work. Understanding these aspects can help you make informed decisions about its use and effectiveness.

Introduction to Terbinafine

Terbinafine is an antifungal medication used to treat a wide range of fungal infections such as athlete’s foot, jock itch, and ringworm. It works by stopping the growth of the fungus and preventing it from spreading. It is available as a tablet, topical cream, or solution to be used directly on the affected area.

Uses for Terbinafine

Terbinafine is used to treat the following fungal infections:

  • Athlete’s foot
  • Jock itch
  • Ringworm
  • Yeast infections
  • Fungal nail infections

Mechanism of Action

Terbinafine works by inhibiting the production of a molecule called squalene epoxidase. This molecule is necessary for the production of ergosterol, a vital component of the cell membranes of fungi. Without this molecule, the cell membranes cannot be formed and the fungus cannot survive and replicate.

How Long Does it Take to Work?

Most people begin to feel relief from their fungal infection within a few days of starting treatment with Terbinafine. It can take up to 4 weeks for symptoms to completely disappear, though the length of treatment may vary depending on the infection.


Terbinafine is readily absorbed in the gastrointestinal tract and is highly bioavailable. Oral doses typically reach peak levels in the bloodstream within 1-2 hours of administration.

Route of Elimination

Terbinafine is mostly metabolized by the liver and then eliminated in the bile and feces. Very little of the drug is excreted in the urine.


Terbinafine is available in the form of tablets, topical cream, or solution for direct application to the affected area. The recommended dosages are as follows:

  • Tablets : 250 mg once or twice daily.
  • Cream : Apply once daily to the affected area.
  • Solution : Apply once or twice daily to the affected area.


For oral tablets, take with a full glass of water, preferably with a meal. When using the topical cream/solution, gently massage into the affected area. Wash hands thoroughly after use.

Side Effects

The most common side effects of Terbinafine include:

  • Stomach upset
  • Diarrhea
  • Nausea
  • Headache
  • Dizziness
  • Skin rash/irritation (with topical formulations)


Terbinafine is generally well tolerated and any side effects are usually mild and short-lived. If taken in large doses or for extended periods of time, it may increase the risk of certain serious side effects. It is important to follow the instructions of your doctor and take the appropriate dosage.


It is important to inform your doctor of any health conditions prior to taking Terbinafine, such as:

  • Liver or kidney disease
  • Heart or blood vessel disorder
  • Any allergies


Terbinafine can interact with other medications or supplements. It is important to inform your doctor of any other medications that you are taking to avoid any possible interactions.

Disease Interaction

Terbinafine may not be suitable for use in certain medical conditions. Be sure to inform your doctor of any medical history prior to beginning treatment.

Drug Interaction

Terbinafine can interact with other drugs and increase the risk of side effects. Some of the medications that may interact with Terbinafine include:

  • Antiseizure medications
  • Cholesterol-lowering drugs
  • Blood pressure medications
  • Diuretics
  • Antidepressants
  • Antifungal medications

Food Interactions

Terbinafine may interact with certain foods and beverages. It is important to follow your doctor's instructions carefully and avoid taking Terbinafine with anything that contains alcohol or caffeine. Eating grapefruit or drinking grapefruit juice while taking Terbinafine may also increase the risk of side effects.

Pregnancy Use

Terbinafine is not generally recommended for pregnant women. If you are pregnant or planning to become pregnant, talk to your doctor before taking Terbinafine.

Lactation Use

It is not known if Terbinafine is safe for use during lactation. Talk to your doctor before taking Terbinafine if you are breastfeeding.

Acute Overdose

If an overdose of Terbinafine is suspected, seek emergency medical attention. Symptoms of an overdose include nausea, abdominal pain, dizziness, and confusion.


Terbinafine should not be taken by people who have certain allergies or medical conditions. It is important to tell your doctor about any allergies or medical issues you have prior to taking Terbinafine.

Use Directions

Terbinafine should be taken as directed by your doctor. For oral tablets, take with a full glass of water, preferably with a meal. When using the topical cream/solution, gently massage into the affected area and wash hands thoroughly after use.

Storage Conditions

Store Terbinafine at room temperature, away from heat, moisture, and direct light. Keep the medication out of reach of children.

Volume of Distribution

The volume of distribution of Terbinafine is approximately 35 liters.

Half Life

The half life of Terbinafine is approximately 6-8 hours.


The clearance of Terbinafine is approximately 10 liters/hour.

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