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|Systematic (IUPAC) name|
|(2S,6'R)- 7-chloro- 2',4,6-trimethoxy- 6'-methyl- 3H,4'H-spiro [1-benzofuran- 2,1'-cyclohexene]- 3,4'-dione|
|Bioavailability||Highly variable (25 to 70%)|
|Metabolism||Hepatic demethylation and glucuronidation|
|(what is this?)|
Griseofulvin (marketed under the proprietary name Grifulvin V by Orthoneutrogena Labs, according to FDA orange book) is an orally administered antifungal drug. It is used both in animals and humans, to treat fungal infections of the skin (commonly known as ringworm) and nails. It is produced by culture of some strains of the mold Penicillium griseofulvum, from which it was isolated in 1939.
It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system.
The first step in the biosynthesis of griseofulvin by P. griseofulvin is the synthesis of the 14-carbon poly-β -keto chain by a type I iterative polyketide synthase (PKS) via iterative addition of 6 malonyl-CoA to an acyl-CoA starter unit. The 14-carbon poly-β -keto chain undergoes cyclization/aromatization, using cyclase/aromatase, respectively, through a Claisen and aldol condensation to form the benzophenone intermediate. The benzophenone intermediate is then methylated via S-adenosylmethionine twice to yield griseophenone C. The griseophenone C is then halogenated at the activated site ortho to the phenol group on the left aromatic ring to form griseophenone B. The halogenated species then undergoes a single phenolic oxidation in both rings forming the two oxygen diradical species. The right oxygen radical shifts alpha to the carbonyl via resonance allowing for a stereospecific radical coupling by the oxygen radical on the left ring forming a tetrahydrofuranone species .  The newly formed grisan skeleton with a spiro center is then O-methylated by SAM to generate dehydrogriseofulvin. Ultimately, a stereoselective reduction of the olefin on dehydrogriseofulvin by NADPH affords griseofulvin. 
Known side effects of griseofulvin include:
Common brand names
- Grifulvin V
- Grison-250 (V.I.P Pharma)
- Grisovin-FP (GSK)
- Gris OD 375 (DR.REDDY'S)
The drug binds to tubulin, interfering with microtubule function, thus inhibiting mitosis. It binds to keratin in keratin precursor cells and makes them resistant to fungal infections. The drug reaches its site of action only when hair or skin is replaced by the keratin-griseofulvin complex. Griseofulvin then enters the dermatophyte through energy-dependent transport processes and bind to fungal microtubules. This alters the processing for mitosis and also underlying information for deposition of fungal cell walls.
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- U.S. Patent 3,038,839
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- Griseofulvin (Medline Plus)
- Antifungal drug causes preferential apoptosis of cancer cells (Oncolink Cancer News)
- Anti-fungal Drug May Help Treat Cancer, Say Scientists at UC Santa Barbara
- dermnetnz Mentions alcohol, contraceptive interactions