Grisactin is a prescription antifungal medication that contains the active ingredient griseofulvin. It is supplied as a 250 mg pill and belongs to the antifungal drug class used to treat infections of the skin, hair, and nails caused by dermatophyte fungi. In Hong Kong, Grisactin is regulated by the Department of Health and is available only with a doctor's prescription.
Griseofulvin interferes with fungal cell division by binding to fungal microtubules. This prevents the fungus from replicating its DNA, effectively halting growth. After oral ingestion, the drug is absorbed and distributes preferentially to keratin-rich tissues such as skin, hair, and nails-exactly where dermatophyte fungi reside. Therapeutic levels are usually reached within a few days, with the full effect becoming apparent after several weeks of consistent use.
Grisactin is approved for the treatment of the following dermatophyte infections:
These indications are recognized by regulatory agencies and reflect the drug’s proven efficacy in clinical trials for dermatophyte-related diseases.
Who should consider Grisactin?
Absolute contraindications
Relative contraindications
Special populations
These reactions are usually transient and subside as the body adjusts to therapy.
This article provides educational information about Grisactin and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.
Yes. Grisactin is indicated for onychomycosis caused by dermatophytes, including infections of the toenails. Treatment usually requires several months of therapy because nail growth is slow.
Take the missed tablet as soon as you remember unless it is nearly time for the next scheduled dose; in that case, skip the missed dose and continue with the regular schedule. Do not double the dose.
Griseofulvin passes into breast milk and may affect the infant. It should be used only if the benefit to the mother outweighs the potential risk to the baby, and an alternative feeding method may be considered.
A fatty meal significantly enhances griseofulvin absorption, leading to higher plasma concentrations and better therapeutic effect. Always take the pill with food that contains some fat.
No strict restrictions, but avoid excessive alcohol consumption, as both the drug and alcohol are processed by the liver and can increase hepatic stress.
Grisactin tablets are 250 mg white, round pills imprinted with “G 250”. Other brands may have different shapes, colors, or imprint codes, but contain the same active ingredient.
Griseofulvin is not a controlled substance and is not screened for in standard workplace drug-testing panels. It should not cause a positive result.
Yes. Grisactin is classified as a prescription-only medication by the Hong Kong Department of Health and must be obtained through a licensed healthcare professional.
Both are oral antifungals, but they work via different mechanisms: griseofulvin disrupts fungal cell division, whereas terbinafine inhibits ergosterol synthesis. Choice of therapy depends on the specific infection, patient tolerance, and physician judgment.
Keep the medication in its original container, protected from heat and moisture. If you will be away from a stable climate for extended periods, consider a small insulated pouch, but avoid freezing temperatures.
