Fluconazole is a triazole antifungal drug developed in the 1980s and introduced into clinical practice in the early 1990s. It is widely used for the treatment and prevention of fungal infections, particularly those caused by Candida species and Cryptococcus neoformans. Its development marked a significant advancement in antifungal therapy due to its improved oral bioavailability, good tissue penetration, and relatively favorable safety profile compared to earlier antifungal agents. Fluconazole became an important option for systemic fungal infections, including candidiasis, cryptococcal meningitis, and prophylaxis in immunocompromised patients such as those with HIV/AIDS. It is included in many standard antifungal treatment guidelines worldwide and remains one of the most commonly used azole antifungals in clinical practice.
BRAND NAMES
Diflucan (most widely known global brand, by Pfizer)
MECHANISM OF ACTION
Fluconazole works by inhibiting the fungal enzyme 14-α-demethylase, which is dependent on cytochrome P450. This enzyme is required for converting lanosterol to ergosterol, an essential component of the fungal cell membrane. Inhibition of ergosterol synthesis leads to increased membrane permeability, disruption of fungal cell integrity, and inhibition of fungal growth. It is primarily fungistatic rather than fungicidal.
PHARMACOKINETICS
Absorption
Fluconazole is well absorbed orally, with bioavailability exceeding 90%. It can be taken with or without food and achieves peak plasma concentrations within 1–2 hours.
Distribution
It is widely distributed in body fluids and tissues, including cerebrospinal fluid (CSF), saliva, and urine. Plasma protein binding is low (~11%), allowing good tissue penetration.
Metabolism
Fluconazole undergoes minimal hepatic metabolism, with most of the drug remaining unchanged in circulation.
Elimination
It is primarily eliminated via the kidneys, with about 80% excreted unchanged in urine. The elimination half-life is approximately 30 hours, allowing once-daily dosing.
PHARMACODYNAMICS
Fluconazole inhibits fungal growth by blocking ergosterol synthesis, weakening the fungal cell membrane. It is effective against Candida species, Cryptococcus neoformans, and some dermatophytes. It shows dose-dependent antifungal activity and good penetration into the central nervous system.
ADMINISTRATION
Fluconazole is administered orally (tablets, capsules, or suspension) or intravenously. It is commonly used in systemic fungal infections and can be given once daily due to its long half-life.
DOSAGE AND STRENGTH
Dosage depends on infection type and severity. Loading doses may be used in severe infections, followed by maintenance therapy. Dose adjustment is required in renal impairment.
DRUG INTERACTIONS
Fluconazole inhibits CYP450 enzymes (especially CYP2C9 and CYP3A4), which can increase levels of drugs like warfarin, phenytoin, and some oral hypoglycemics, requiring careful monitoring.
FOOD INTERACTIONS
Fluconazole has no significant food interactions and can be taken with or without meals.
CONTRAINDICATIONS
It is contraindicated in patients with known hypersensitivity to azole antifungals. Caution is needed in severe liver disease.
SIDE EFFECTS
Nausea and vomiting
Abdominal pain
Headache
Skin rash
Elevated liver enzymes (rare hepatotoxicity)
OVER DOSAGE
BRAND NAMES
Diflucan (most widely known global brand, by Pfizer)
MECHANISM OF ACTION
Fluconazole works by inhibiting the fungal enzyme 14-α-demethylase, which is dependent on cytochrome P450. This enzyme is required for converting lanosterol to ergosterol, an essential component of the fungal cell membrane. Inhibition of ergosterol synthesis leads to increased membrane permeability, disruption of fungal cell integrity, and inhibition of fungal growth. It is primarily fungistatic rather than fungicidal.
PHARMACOKINETICS
Absorption
Fluconazole is well absorbed orally, with bioavailability exceeding 90%. It can be taken with or without food and achieves peak plasma concentrations within 1–2 hours.
Distribution
It is widely distributed in body fluids and tissues, including cerebrospinal fluid (CSF), saliva, and urine. Plasma protein binding is low (~11%), allowing good tissue penetration.
Metabolism
Fluconazole undergoes minimal hepatic metabolism, with most of the drug remaining unchanged in circulation.
Elimination
It is primarily eliminated via the kidneys, with about 80% excreted unchanged in urine. The elimination half-life is approximately 30 hours, allowing once-daily dosing.
PHARMACODYNAMICS
Fluconazole inhibits fungal growth by blocking ergosterol synthesis, weakening the fungal cell membrane. It is effective against Candida species, Cryptococcus neoformans, and some dermatophytes. It shows dose-dependent antifungal activity and good penetration into the central nervous system.
ADMINISTRATION
Fluconazole is administered orally (tablets, capsules, or suspension) or intravenously. It is commonly used in systemic fungal infections and can be given once daily due to its long half-life.
DOSAGE AND STRENGTH
Dosage depends on infection type and severity. Loading doses may be used in severe infections, followed by maintenance therapy. Dose adjustment is required in renal impairment.
DRUG INTERACTIONS
Fluconazole inhibits CYP450 enzymes (especially CYP2C9 and CYP3A4), which can increase levels of drugs like warfarin, phenytoin, and some oral hypoglycemics, requiring careful monitoring.
FOOD INTERACTIONS
Fluconazole has no significant food interactions and can be taken with or without meals.
CONTRAINDICATIONS
It is contraindicated in patients with known hypersensitivity to azole antifungals. Caution is needed in severe liver disease.
SIDE EFFECTS
Nausea and vomiting
Abdominal pain
Headache
Skin rash
Elevated liver enzymes (rare hepatotoxicity)
OVER DOSAGE
Overdose of fluconazole is usually related to excessive intake or accidental high dosing, especially in patients with impaired renal function where the drug can accumulate. The main effects are gastrointestinal and central nervous system related, including nausea, vomiting, abdominal pain, diarrhea, headache, and dizziness.
TOXICITY
Overdose of Fluconazole may cause nausea, vomiting, abdominal pain, and in severe cases, liver toxicity or neurological symptoms such as seizures. Management is supportive, including symptomatic treatment and monitoring of liver function. Hemodialysis can help remove the drug in severe overdose due to its renal elimination.BRAND NAMES
Diflucan (most widely known global brand, by Pfizer)
MECHANISM OF ACTION
Fluconazole works by inhibiting the fungal enzyme 14-α-demethylase, which is dependent on cytochrome P450. This enzyme is required for converting lanosterol to ergosterol, an essential component of the fungal cell membrane. Inhibition of ergosterol synthesis leads to increased membrane permeability, disruption of fungal cell integrity, and inhibition of fungal growth. It is primarily fungistatic rather than fungicidal.
PHARMACOKINETICS
Absorption
Fluconazole is well absorbed orally, with bioavailability exceeding 90%. It can be taken with or without food and achieves peak plasma concentrations within 1–2 hours.
Distribution
It is widely distributed in body fluids and tissues, including cerebrospinal fluid (CSF), saliva, and urine. Plasma protein binding is low (~11%), allowing good tissue penetration.
Metabolism
Fluconazole undergoes minimal hepatic metabolism, with most of the drug remaining unchanged in circulation.
Elimination
It is primarily eliminated via the kidneys, with about 80% excreted unchanged in urine. The elimination half-life is approximately 30 hours, allowing once-daily dosing.
PHARMACODYNAMICS
Fluconazole inhibits fungal growth by blocking ergosterol synthesis, weakening the fungal cell membrane. It is effective against Candida species, Cryptococcus neoformans, and some dermatophytes. It shows dose-dependent antifungal activity and good penetration into the central nervous system.
ADMINISTRATION
Fluconazole is administered orally (tablets, capsules, or suspension) or intravenously. It is commonly used in systemic fungal infections and can be given once daily due to its long half-life.
DOSAGE AND STRENGTH
Dosage depends on infection type and severity. Loading doses may be used in severe infections, followed by maintenance therapy. Dose adjustment is required in renal impairment.
DRUG INTERACTIONS
Fluconazole inhibits CYP450 enzymes (especially CYP2C9 and CYP3A4), which can increase levels of drugs like warfarin, phenytoin, and some oral hypoglycemics, requiring careful monitoring.
FOOD INTERACTIONS
Fluconazole has no significant food interactions and can be taken with or without meals.
CONTRAINDICATIONS
It is contraindicated in patients with known hypersensitivity to azole antifungals. Caution is needed in severe liver disease.
SIDE EFFECTS
Nausea and vomiting
Abdominal pain
Headache
Skin rash
Elevated liver enzymes (rare hepatotoxicity)
OVER DOSAGE
BRAND NAMES
Diflucan (most widely known global brand, by Pfizer)
MECHANISM OF ACTION
Fluconazole works by inhibiting the fungal enzyme 14-α-demethylase, which is dependent on cytochrome P450. This enzyme is required for converting lanosterol to ergosterol, an essential component of the fungal cell membrane. Inhibition of ergosterol synthesis leads to increased membrane permeability, disruption of fungal cell integrity, and inhibition of fungal growth. It is primarily fungistatic rather than fungicidal.
PHARMACOKINETICS
Absorption
Fluconazole is well absorbed orally, with bioavailability exceeding 90%. It can be taken with or without food and achieves peak plasma concentrations within 1–2 hours.
Distribution
It is widely distributed in body fluids and tissues, including cerebrospinal fluid (CSF), saliva, and urine. Plasma protein binding is low (~11%), allowing good tissue penetration.
Metabolism
Fluconazole undergoes minimal hepatic metabolism, with most of the drug remaining unchanged in circulation.
Elimination
It is primarily eliminated via the kidneys, with about 80% excreted unchanged in urine. The elimination half-life is approximately 30 hours, allowing once-daily dosing.
PHARMACODYNAMICS
Fluconazole inhibits fungal growth by blocking ergosterol synthesis, weakening the fungal cell membrane. It is effective against Candida species, Cryptococcus neoformans, and some dermatophytes. It shows dose-dependent antifungal activity and good penetration into the central nervous system.
ADMINISTRATION
Fluconazole is administered orally (tablets, capsules, or suspension) or intravenously. It is commonly used in systemic fungal infections and can be given once daily due to its long half-life.
DOSAGE AND STRENGTH
Dosage depends on infection type and severity. Loading doses may be used in severe infections, followed by maintenance therapy. Dose adjustment is required in renal impairment.
DRUG INTERACTIONS
Fluconazole inhibits CYP450 enzymes (especially CYP2C9 and CYP3A4), which can increase levels of drugs like warfarin, phenytoin, and some oral hypoglycemics, requiring careful monitoring.
FOOD INTERACTIONS
Fluconazole has no significant food interactions and can be taken with or without meals.
CONTRAINDICATIONS
It is contraindicated in patients with known hypersensitivity to azole antifungals. Caution is needed in severe liver disease.
SIDE EFFECTS
Nausea and vomiting
Abdominal pain
Headache
Skin rash
Elevated liver enzymes (rare hepatotoxicity)
OVER DOSAGE
Overdose of fluconazole is usually related to excessive intake or accidental high dosing, especially in patients with impaired renal function where the drug can accumulate. The main effects are gastrointestinal and central nervous system related, including nausea, vomiting, abdominal pain, diarrhea, headache, and dizziness.
TOXICITY
Overdose of Fluconazole may cause nausea, vomiting, abdominal pain, and in severe cases, liver toxicity or neurological symptoms such as seizures. Management is supportive, including symptomatic treatment and monitoring of liver function. Hemodialysis can help remove the drug in severe overdose due to its renal elimination.
TOXICITY
Overdose of Fluconazole may cause nausea, vomiting, abdominal pain, and in severe cases, liver toxicity or neurological symptoms such as seizures. Management is supportive, including symptomatic treatment and monitoring of liver function. Hemodialysis can help remove the drug in severe overdose due to its renal elimination.
TOXICITY
Overdose of Fluconazole may cause nausea, vomiting, abdominal pain, and in severe cases, liver toxicity or neurological symptoms such as seizures. Management is supportive, including symptomatic treatment and monitoring of liver function. Hemodialysis can help remove the drug in severe overdose due to its renal elimination.
