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Terbinafine Hydrochloride

Terbinafine Hydrochloride, commonly known as Lamisil, is an antifungal medication that has been the subject of several clinical trials. These studies aim to evaluate its effectiveness, safety, and new delivery methods for treating various fungal infections, particularly onychomycosis (toenail fungus) and tinea capitis (scalp ringworm). The trials explore different formulations, including oral tablets, topical solutions, and innovative delivery systems, to improve treatment outcomes for patients with these persistent fungal conditions.

Table of Contents

What is Terbinafine Hydrochloride?

Terbinafine Hydrochloride is an antifungal medication used to treat various fungal infections. It’s also known by the brand name Lamisil[6]. This drug belongs to a class of medications called allylamine antifungal agents, which work by stopping the growth of fungi[5].

What Conditions Does Terbinafine Treat?

Terbinafine is used to treat several fungal infections, including:

  • Onychomycosis: This is a fungal infection of the toenails or fingernails, also known as nail fungus[6].
  • Tinea pedis: Commonly known as athlete’s foot, this is a fungal infection of the feet[1].
  • Tinea capitis: This is a fungal infection of the scalp, primarily occurring in children[5].
  • Oral candidiasis: Also known as thrush, this is a fungal infection in the mouth. Terbinafine has been studied for use in HIV-positive patients with thrush that hasn’t responded to other treatments[7].

Available Formulations

Terbinafine Hydrochloride is available in several forms:

  • Oral tablets: Usually 250 mg, taken once daily[4].
  • Topical cream: A 1% formulation applied directly to the skin[2].
  • Nail lacquer: A 10% solution applied directly to affected nails[2].
  • Topical gel: Used in some studies for iontophoretic delivery (a method using a small electric charge to deliver the medication through the skin)[3].

How Does Terbinafine Work?

Terbinafine works by interfering with the fungal cell’s ability to produce a substance called ergosterol, which is essential for the fungal cell membrane. Without ergosterol, the fungus cannot maintain its cell structure and eventually dies. This mechanism allows terbinafine to effectively combat a wide range of fungal infections[5].

Efficacy of Terbinafine

The effectiveness of terbinafine varies depending on the condition being treated and the formulation used:

  • For onychomycosis (nail fungus), studies have looked at “complete cure” rates, which means both elimination of the fungus and improvement in the appearance of the nail. In one study, this was assessed after 24 or 48 weeks of treatment[8].
  • For tinea pedis (athlete’s foot), one study compared a single application of terbinafine to other treatments, assessing effectiveness after 6 weeks[1].
  • For tinea capitis (scalp fungal infection), a study compared terbinafine to another antifungal medication called griseofulvin, looking at complete cure rates after 10 weeks of treatment[5].

Safety and Side Effects

Like all medications, terbinafine can cause side effects. The safety profile can vary depending on the formulation and duration of use. Common measures of safety in clinical trials include:

  • The number of adverse events (side effects) reported by patients
  • The number of serious adverse events
  • The number of patients who had to stop treatment due to side effects

Specific side effects aren’t detailed in the provided studies, but patients should discuss potential risks with their healthcare provider before starting treatment[8].

Ongoing Research

Research on terbinafine is ongoing, with studies looking at:

  • New formulations, such as nail lacquers and gels, which may improve delivery of the medication to infected nails[3].
  • Comparing the effectiveness of terbinafine to other antifungal medications[1].
  • The use of terbinafine in specific populations, such as HIV-positive patients with resistant fungal infections[7].
  • Different treatment durations to determine the optimal length of therapy[8].

As with any medication, patients should always consult with their healthcare provider to determine if terbinafine is appropriate for their specific condition and to understand the potential benefits and risks of treatment.

Aspect Details
Drug Formulations Oral tablets (250 mg), topical solutions (1% and 10%), nail lacquers, creams, gels
Main Conditions Treated Onychomycosis (toenail fungus), Tinea Capitis (scalp ringworm)
Treatment Durations Ranging from 7 days to 48 weeks, depending on the study and condition
Key Outcome Measures Complete cure rates, mycological cure, clinical effectiveness, safety assessments
Innovative Approaches Iontophoretic delivery, nail lacquer formulations
Patient Populations Adults with onychomycosis, children with tinea capitis, healthy subjects for bioequivalence studies
Comparison Studies Bioequivalence studies comparing generic versions to brand-name Lamisil

FAQ

  • What is Terbinafine Hydrochloride used for in these clinical trials? Terbinafine Hydrochloride is primarily used to treat fungal infections, especially onychomycosis (toenail fungus) and tinea capitis (scalp ringworm) in children. The trials explore its effectiveness in various formulations, including oral tablets, topical solutions, and nail lacquers.
  • How is Terbinafine Hydrochloride administered in these studies? The medication is administered in several ways, depending on the study. Some trials use oral tablets (250 mg), while others explore topical applications such as nail lacquers, creams, or gels. Some innovative studies even investigate iontophoretic delivery, which uses a small electric charge to deliver the drug across the skin and nails.
  • What are the main outcomes measured in these clinical trials? The main outcomes typically include complete cure rates (both clinical and mycological), safety assessments through monitoring adverse events, and in some cases, the levels of terbinafine in the bloodstream or nail bed. Mycological cure (negative lab tests for fungus) and clinical effectiveness (improvement in nail appearance) are common measures of success.
  • How long do the treatments usually last in these trials? Treatment duration varies widely among the studies. Some trials last for 7 days, while others extend to 24 or 48 weeks. The length often depends on the type of infection being treated and the method of drug delivery being studied.
  • Are there any special considerations for patients participating in these trials? Yes, some trials have specific requirements. For instance, some studies focus on patients with mild to moderate toenail fungus, while others may include patients who haven't responded to previous treatments. Additionally, some trials compare the effectiveness of Terbinafine Hydrochloride under different conditions, such as fasting versus fed states.

Ongoing Clinical Trials on Terbinafine Hydrochloride

  • Study of fosmanogepix compared to standard antifungal drugs for treating invasive mold infections in adults

    Recruiting

    1 1 1 1
    Investigated drugs:
    Austria Belgium France Germany Greece Italy +2

  • Study on the Safety and Effectiveness of Terbinafine Solution for Treating Mild to Moderate Nail Fungus in Children Aged 6-17 Years

    Recruiting

    1 1 1
    Investigated drugs:
    Denmark Iceland Italy Poland

Glossary

  • Onychomycosis: A fungal infection of the nail, often causing thickening, discoloration, and separation of the nail from the nail bed.
  • Tinea Capitis: A fungal infection of the scalp, also known as scalp ringworm, which can cause hair loss and scaling.
  • Mycological Cure: The absence of fungus as confirmed by laboratory tests, typically involving negative results from both microscopic examination (KOH test) and fungal culture.
  • Clinical Effectiveness: In these studies, it often refers to a combination of mycological cure and significant improvement in the appearance of the affected nail or skin.
  • Iontophoresis: A method of drug delivery that uses a small electric current to help a medication penetrate the skin or nails more effectively.
  • Bioequivalence: The property of two drug products having the same rate and extent of absorption, used to compare generic versions of a drug to the original brand-name version.
  • Pharmacokinetics: The study of how a drug moves through the body, including its absorption, distribution, metabolism, and excretion.
  • Adverse Event (AE): Any unfavorable and unintended sign, symptom, or disease temporarily associated with the use of a medical treatment or procedure.

References

  1. https://clinicaltrials.gov/study/NCT03999437
  2. https://clinicaltrials.gov/study/NCT00691184
  3. https://clinicaltrials.gov/study/NCT01484145
  4. https://clinicaltrials.gov/study/NCT01286701
  5. https://clinicaltrials.gov/study/NCT00117754
  6. https://clinicaltrials.gov/study/NCT00443820
  7. https://clinicaltrials.gov/study/NCT00002394
  8. https://clinicaltrials.gov/study/NCT00443898