From the FDA Drug Label
The FDA drug label does not answer the question.
From the Research
Lamisil cream 1% (terbinafine) is effective for treating ringworm, a common fungal skin infection, with a mycological cure rate of 84.2% when applied once daily for 7 days, as shown in a study published in 2001 1. To treat ringworm using Lamisil cream 1%, apply a thin layer to the affected area and surrounding skin once daily for 1 week, as this duration has been shown to be effective in achieving and maintaining mycological cure 1. Before application, wash and dry the area thoroughly. Some key points to consider when using Lamisil cream 1% for ringworm treatment include:
- The cream should be applied once daily for 7 days, as this regimen has been demonstrated to be effective in a clinical study 1.
- It is essential to continue using the cream for the full recommended duration, even if symptoms improve earlier, to prevent recurrence.
- Lamisil works by inhibiting the enzyme squalene epoxidase, which disrupts fungal cell membrane formation, ultimately killing the fungus.
- Side effects are typically mild and may include redness, itching, or burning at the application site.
- If symptoms worsen or don't improve after the treatment period, consult a healthcare provider.
- To prevent reinfection, wash bedding and clothing regularly, avoid sharing personal items, keep skin clean and dry, and wear breathable fabrics. It is also worth noting that a more recent study from 2014 found that terbinafine had a significantly higher clinical cure rate compared to placebo, with a risk ratio of 4.51 and a number needed to treat of 3 2. However, the most recent and highest quality study relevant to the treatment of ringworm with Lamisil cream 1% is the 2001 study, which provides guidance on the effective treatment duration and application frequency 1.