Terbinafine tablets are an antifungal medication used to treat fungal infections of the nails and skin [1][2]. They are particularly effective against infections caused by dermatophytes, a common type of fungus [1].
How do terbinafine tablets work?
Terbinafine works by inhibiting an enzyme called squalene epoxidase, which is essential for the synthesis of ergosterol in fungi [3]. Ergosterol is a key component of fungal cell membranes. By disrupting ergosterol production, terbinafine leads to a deficiency in this vital component, causing the fungal cell membrane to become unstable and eventually leading to fungal cell death [3].
What types of fungal infections do terbinafine tablets treat?
Terbinafine tablets are primarily prescribed for onychomycosis, which is a fungal infection of the toenails or fingernails [1][2]. They are also used for certain skin infections like ringworm (tinea corporis), jock itch (tinea cruris), and athlete's foot (tinea pedis) that are extensive or have not responded to topical treatments [1].
How long does treatment with terbinafine tablets typically last?
The duration of terbinafine tablet treatment varies depending on the location and severity of the fungal infection [1]. For nail infections, treatment commonly lasts for 6 to 12 weeks [1]. Skin infections may require shorter treatment courses, typically ranging from 2 to 4 weeks [1]. Full recovery, especially for nail infections, may not be apparent until new, healthy nail or skin has grown [1].
Are there any alternatives to terbinafine tablets for nail fungus?
Alternatives to oral terbinafine for nail fungus include topical antifungal medications, such as ciclopirox and efinaconazole, which are applied directly to the affected nails [4]. In some cases, other oral antifungal drugs like itraconazole may be used [5]. However, oral terbinafine is generally considered highly effective for nail infections [1].
What are the potential side effects of terbinafine tablets?
Common side effects of terbinafine tablets can include gastrointestinal issues such as diarrhea, indigestion, nausea, and abdominal pain [1]. Other reported side effects include headache, rash, and changes in taste perception [1]. Less commonly, more serious side effects like liver problems and allergic reactions can occur [1]. It is important for patients to report any unusual symptoms to their healthcare provider [1].
When does the patent for terbinafine expire?
Terbinafine was first patented many years ago, and the original patents have long expired, making it a generic medication [6]. DrugPatentWatch.com tracks patent information for pharmaceuticals, and for older drugs like terbinafine, the primary market protection has concluded [6].
Can generic terbinafine tablets be manufactured and sold?
Yes, because the patents for the original terbinafine formulations have expired, generic versions of terbinafine tablets are available [6]. This has made the medication more accessible and affordable [7].
Sources:
[1] https://www.nhs.uk/medicines/terbinafine-oral/
[2] https://www.medicalnewstoday.com/articles/terbinafine
[3] https://pubmed.ncbi.nlm.nih.gov/20957086/
[4] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6344067/
[5] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3707368/
[6] https://drugpatentwatch.com/
[7] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5137518/