Diflucan (Fluconazole)

O que é Diflucan?

Diflucan (fluconazole) is an oral antifungal receita médica medicamento widely used to treat infections caused by Candida species. It is approved by the Agência Europeia de Medicamentos (EMA) and is listed on the WHO Model List of Essential Medicines. In sexual health, it is most commonly prescribed as a single 150 mg cápsula for uncomplicated vaginal candidiasis (vaginal thrush).

Fluconazole’s convenience — a single oral dose rather than a multi-day vaginal tratamento — makes it one of the most prescribed antifungal medicamentos in Europe. It acts systemically, reaching the site of infection through the bloodstream and vaginal secretions.

Como funciona Diflucan work?

Fluconazole belongs to the triazole class of antifungals and works by selectively inhibiting the fungal enzyme lanosterol 14-alpha-demethylase (also known as CYP51). This enzyme is essential for the conversion of lanosterol to ergosterol, the primary sterol component of the fungal cell membrane.

Without adequate ergosterol:

• Cell membrane integrity is compromised: The fungal membrane becomes permeable and structurally unstable
• Essential cellular functions fail: Transport of nutrients and maintenance of intracellular conditions break down
• Fungal growth halts: At lower concentrations, growth is inhibited (fungistatic); at higher concentrations, cell death occurs (fungicidal)

Fluconazole’s selectivity for fungal CYP51 over human CYP enzymes explains its generally good tolerability, though its effect on human CYP enzymes (particularly CYP2C9 and CYP3A4) at therapeutic doses does give rise to clinically significant drug interactions.

Pharmacokinetic advantages:

• Well absorbed orally (bioavailability >90%)
• Long plasma half-life (~30 hours) allows once-daily or single-dose tratamento
• Widely distributed throughout body tissues and fluids, including vaginal secretions
• Primarily renally excreted unchanged

Para quem é Diflucan for?

Diflucan is indicated for adults with fungal infections caused by susceptible Candida species, including:

• Vaginal candidiasis (thrush): Single 150 mg oral dose for uncomplicated infections
• Oropharyngeal candidiasis (oral thrush): Typically 50–100 mg daily for 7–14 days
• Oesophageal candidiasis: Higher doses under specialist supervision
• Recurrent vulvovaginal candidiasis: Maintenance regimens (e.g., weekly fluconazole) may be prescribed for pacientes with four or more episodes per year
• Dermatophyte infections / tinea: Selected skin fungal infections under medical guidance

Not appropriate for:

• Patients with known allergy to fluconazole or other azole antifungals
• Pregnant women (especially first trimester)
• Patients with QT prolongation or taking medicamentos that prolong the QT interval
• Concurrent use of certain interacting medicamentos without specialist review

Dosagem

Indication	Dose	Duration
Uncomplicated vaginal candidiasis	150 mg	Single dose
Recurrent vaginal candidiasis (maintenance)	150 mg weekly	6 months (specialist guidance)
Oral thrush	50–100 mg once daily	7–14 days
Severe/systemic candidiasis	Higher doses	Specialist management

Diflucan cápsulas should be swallowed whole with water. They can be taken with or without food. No dose adjustment is required for body weight in most cases, but renal impairment may require dose reduction.

Efeitos secundários

Diflucan is generally well tolerated at the 150 mg single dose utilizado para vaginal candidiasis.

Efeitos secundários comuns (afetando 1 a 10 em 100 pessoas)

• Headache
• Nausea
• Abdominal pain
• Diarrhoea
• Dizziness

Menos comuns efeito secundários

• Skin rash
• Elevated liver enzymes (particularly with prolonged or high-dose use)
• Taste disturbances
• Flatulence

Efeitos secundários graves (rare)

• Hepatotoxicity: Severe liver reactions including hepatitis and hepatic failure — risk increases with prolonged use and in pacientes with pre-existing liver disease
• Cardiac arrhythmias: QT prolongation and torsades de pointes — risk is higher when combined with other QT-prolonging medicamentos
• Serious allergic reactions: Including anaphylaxis and Stevens-Johnson syndrome (very rare)
• Adrenal insufficiency: Rare, reported with long-term high-dose use

Diflucan vs alternativas antifungal tratamentos

Treatment	Active Ingredient	Route	Dosing	Notes
Diflucan	Fluconazole	Oral	Single 150 mg dose	Convenient; drug interactions to consider
Canesten Gyno	Clotrimazole	Vaginal pessary	Single dose or 3–6 nights	No significant drug interactions; preferred in pregnancy
Nystan	Nystatin	Vaginal pessary	14 nights	Longer course; for azole-resistant cases
Itraconazole	Itraconazole	Oral	200 mg twice daily for 1 day	Alternative triazole

Diflucan vs Canesten Gyno: Both are effective for uncomplicated vaginal thrush. The choice often comes down to paciente preference (oral vs vaginal), drug interactions, and suitability during pregnancy. Clotrimazole (Canesten Gyno) is preferred in pregnancy due to minimal systemic absorption.

Como aceder a Diflucan online na Europa

Diflucan (fluconazole) is a medicamento sujeito a receita médica (POM) in most estados-membros da UE. It cannot legally be dispensed without a valid receita médica from a licensed medical professional in these jurisdictions.

Prescrivia operates as a technology intermediary: we do not prescribe medicamentos, employ médicos, or sell medicamentos. Our platform connects pacientes with independent EU-registered médicos who can conduct confidential online health assessments.

The process:

1. Complete uma avaliação de saúde: Describe your symptoms, relevant health history, and any medications you currently take.
2. Avaliação médica: An independent EU-registered médico reviews your assessment. If fluconazole is clinically appropriate, they may issue a receita médica.
3. Dispensa na farmácia: The receita médica is sent to a licensed EU farmácia partner for dispensing and direct delivery.

Important: A Prescrivia não garante that a receita médica will be issued. All prescribing decisions are made independently by qualified medical professionals.

Informação de segurança importante

Do not take Diflucan if you:

• Are pregnant or planning to become pregnant (particularly first trimester)
• Are allergic to fluconazole or other azole antifungals
• Are taking terfenadine, astemizole, cisapride, pimozide, quinidine, or erythromycin (serious cardiac interaction risk)

Informe o seu médico before taking Diflucan if you:

• Are breastfeeding (fluconazole passes into breast milk)
• Have liver disease
• Have kidney disease (dose adjustment may be needed)
• Have a heart condition or are at risk of QT prolongation
• Are taking warfarin, statins, oral hypoglycaemics, ciclosporin, tacrolimus, or phenytoin
• Are taking any other receita médica or over-the-counter medicamentos

Recurrent infections: Frequent vaginal candidiasis (four or more episodes per year) should prompt investigation by a médico for underlying causes such as diabetes, immune system conditions, or antibiotic use patterns.

Fontes

Medical information on this page is based on the following sources:

• Agência Europeia de Medicamentos (EMA). Diflucan (fluconazole) — Summary of Product Characteristics. Available at: ema.europa.eu
• Organização Mundial da Saúde (WHO). WHO Model List of Essential Medicines. 22nd edition, 2021. who.int
• European STI Guidelines Editorial Board. 2018 European guideline on the management of vulvovaginal candidiasis. Journal of the European Academy of Dermatology and Venereology.

This content is reviewed periodically to reflect updated clinical guidance. It is provided for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for advice relevant to your individual health circumstances.