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Terbinafine Dosing

Terbinafine dosing guidelines for treating fingernail fungus call for 250 mg, taken once a day for six weeks. While the dosage for treating toenail fungus is also 250 mg once a day, the medication should be taken for 12 weeks. Dosing guidelines for tinea capitis will be based on the patient's weight, among other things.

Terbinafine Dosing: An Overview

The dose of terbinafine (Lamisil®) that your healthcare provider recommends will vary depending on a number of factors, including:
  • The type of fungal infection you have
  • Your weight (for children)
  • Other medical conditions you may have
  • Other medications you may be taking.
As with any medication, do not adjust your terbinafine dose unless your healthcare provider specifically instructs you to do so.

Terbinafine Dosage for Fingernail Fungus Infection

For fingernail fungus in adults, the dose of terbinafine is 250 mg, taken by mouth once a day for six weeks.

Terbinafine Dosage for Toenail Fungus Infection

For toenail fungus in adults, the dose of terbinafine is 250 mg, taken by mouth once a day for 12 weeks.

Terbinafine Dosage for Ringworm of the Scalp

For treating ringworm of the scalp (tinea capitis), your child's healthcare provider will calculate the appropriate terbinafinel dose based on your child's weight. For this type of infection, terbinafine is usually taken for six weeks. Only terbinafine oral granules (not tablets) are approved for this use.

General Terbinafine Dosing Information

Considerations for people taking terbinafine include the following:
  • The medication comes in tablet form. It should be taken by mouth once a day. For treating ringworm of the scalp, terbinafine comes in oral granule form (which is also taken by mouth once a day).
  • For fingernail fungus or ringworm of the scalp, terbinafine should be taken for six weeks. For toenail fungus, it should be taken for 12 weeks.


  • Terbinafine can be taken with or without food.  


  • Terbinafine oral granules should be sprinkled on a spoonful of non-acidic food, such as pudding or mashed potatoes (but not on applesauce or any fruit-based foods).
  • Terbinafine should be taken at the same time each day to maintain an even level of the drug in your system.
  • For the drug to work properly, it must be taken as prescribed. Terbinafine will not work if you stop taking it.


  • If you are unsure about anything related to terbinafine or terbinafine dosing, talk to your doctor, nurse, or pharmacist. Do not stop taking terbinafine without discussing it first with your healthcare provider.

Terbinafine HCl

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