Revatio (Sildenafil Citrate)

Revatio (Sildenafil Citrate): Comprehensive Patient Guide for Australia

Basic Product Information

What is Revatio and How Does It Work?

Revatio contains the active ingredient sildenafil citrate and is used to treat pulmonary arterial hypertension (PAH) in adults and children aged 1 year and older. PAH is a rare, progressive disease in which high blood pressure develops in the arteries of the lungs, leading to shortness of breath, fatigue, and reduced ability to exercise.

For Patients (Simple Explanation): In PAH, blood vessels in the lungs get narrow and stiff. Revatio works by relaxing and widening these vessels, making it easier for your heart to pump blood through your lungs. This helps increase your ability to exercise and reduces symptoms like breathlessness.

For Specialists: Sildenafil is a selective inhibitor of phosphodiesterase type 5 (PDE5). By inhibiting PDE5, it enhances the effect of nitric oxide (NO) by increasing cyclic guanosine monophosphate (cGMP) in the pulmonary vasculature, resulting in vasodilation and reduced pulmonary vascular resistance.

Pharmacokinetics (What Happens to Revatio in Your Body)

• Absorption: Sildenafil is rapidly absorbed after oral administration. Peak plasma concentrations are reached within 30–120 minutes (average 60 minutes).
• Metabolism: Mainly processed in the liver by enzymes (primarily CYP3A4 and, to a lesser extent, CYP2C9).
• Elimination: Mostly eliminated as inactive metabolites via faeces (80%) and urine (13%).
• Duration of action: Effects last approximately 4–6 hours.
• Half-life: About 4 hours.

Use in Everyday Life and Best Practices (Australian Context)

Revatio should be used exactly as prescribed by your doctor – do not stop or change the dose unless advised. In Australia, Revatio is generally dispensed by community and hospital pharmacies; regular PBS prescription and review by a specialist (usually a cardiologist or respiratory physician) is typical.

• Tablets: Swallow whole with water. Do not crush or chew unless your pharmacist has prepared a special formulation.
• Oral Suspension: Shake well before use. Measure each dose with a marked oral syringe or dose cup provided by your pharmacy.
• Missed Dose: If you miss a dose, take it as soon as you remember, but if it is nearly time for your next dose, skip the missed dose. Do not take double doses.
• General tip: Aim for the same times each day to help form a routine.

Dosing in the Morning versus Evening

• Usual dosing: 20mg three times a day for adults, spaced 6–8 hours apart (e.g., morning, midday, and evening).
• Morning dosing: May aid routine with breakfast or other medicines. Some patients find morning doses more convenient if they experience sleep issues with evening medication.
• Evening dosing: Necessary for three-times-daily regimens. However, taking the last dose early in the evening may help avoid sleep disturbances.
• Best practice: Take doses at regular times spaced 6–8 hours apart, with or without food unless directed otherwise.

Taking Revatio With Food or on an Empty Stomach

• With food: Can be taken with or without food. However, Australian studies note that a high-fat meal may slightly delay its action or reduce absorption, meaning it may take a little longer to work.
• Empty stomach: Taking Revatio on an empty stomach may result in faster onset.
• Australian dietary habits: Standard meals or a light snack are generally fine. If you have a heavy, high-fat meal (e.g., bacon and eggs), you may notice a slower response.

Interaction Warnings: Food, Alcohol, Medications

Indications: When Is Revatio Used?

Clinical Dosing: According to Indication & Patient Group

Safety Profile & Side Effects

Warnings: Seek urgent medical attention for signs of a severe allergic reaction, sudden hearing or vision loss, or chest pain.

Guidelines for Proper Use in Australia

• Only use as prescribed. Never share with others.
• Keep regular appointments for ongoing review with your PAH specialist.
• Let all your healthcare providers (including dentists and pharmacists) know you are taking Revatio.
• Store at room temperature, protected from moisture and sunlight. Keep out of reach of children.
• For oral suspension, discard any unused bottle 60 days after opening.
• Drive or use machines with caution, especially if dizzy or experiencing visual changes.

Alternative Treatment Options (PBS Reimbursed in Australia)

• Bosentan (Tracleer): Oral endothelin receptor antagonist for PAH. Effective for many, but may affect liver enzymes. Used alone or in combination.
• Ambrisentan, Macitentan: Newer endothelin antagonists with less risk of liver enzyme elevation.
• Selexipag: Oral prostacyclin receptor agonist for advanced PAH; needs careful titration.
• Iloprost, Epoprostenol: Inhaled or intravenous prostacyclin analogues. Reserved for more severe or rapidly progressing cases.
• Tadalafil (Adcirca): Another PDE5 inhibitor, taken once daily is available for PAH and may be preferred by some for convenience.

Your specialist will choose based on your medical history, symptoms, other conditions, and preferences. All options are available via the PBS for eligible patients.

Legal, Registration, and Reimbursement Status in Australia

• Marketing Authorisation: Registered by the Therapeutic Goods Administration (TGA) for PAH.
• Legal classification: Prescription only (Schedule 4, S4).
• Reimbursement: Subsidised by the Pharmaceutical Benefits Scheme (PBS) when prescribed for PAH by approved specialists.
• Regular review: Required for ongoing prescription and PBS subsidy.

Latest Research & Clinical Guidance (2022–2025)

• Australian and international guidelines recommend early diagnosis and combination therapy for PAH, often starting with a PDE5 inhibitor (such as Revatio or tadalafil) combined with an endothelin antagonist (bosentan, ambrisentan, or macitentan) for improved outcomes (Sitbon O et al., Eur Respir J 2022; Australian Prescriber 2023).
• Long-term registries show significant improvement in exercise capacity and survival with sildenafil in PAH (O’Connell C et al., Heart Lung Circ 2024).
• Children’s use of Revatio is supported for selected patients (TGA 2023 safety update, UK NICE guidance 2022).
• Never use Revatio for erectile dysfunction—in Australia, this is considered off-label and not recommended (PBS, 2024).
• Do not combine Revatio with nitrates or riociguat due to serious risk of hypotension—recent safety alerts reinforced in 2023 by TGA.

Availability & Delivery in Australia

*Your local pharmacy can usually order overnight. If urgent, ask about direct-from-wholesaler delivery.

Frequently Asked Questions (FAQ)

1. Can I use Revatio for high blood pressure or erectile dysfunction?
   No. Revatio is approved in Australia specifically for pulmonary arterial hypertension (PAH). For other uses, such as erectile dysfunction, a different prescription (Viagra or generic sildenafil) is needed, and only under your doctor’s advice.
2. What happens if I miss a dose?
   If you forget a dose, take it as soon as you remember, but skip if it is nearly time for your next scheduled dose. Never double-dose to catch up.
3. Can I drink alcohol while taking Revatio?
   Moderate alcohol is unlikely to cause major issues, but large quantities may increase risk of dizziness or fainting. It is safest to limit or avoid alcohol.
4. What if I feel side effects?
   Most side effects are mild and temporary. If you develop severe headache, vision or hearing changes, chest pain, or signs of allergy (swelling or breathing trouble), seek urgent medical attention.
5. Is Revatio safe for children?
   Revatio is TGA-approved in children aged 1 year and over for PAH, but dosing and monitoring should be by an experienced paediatric specialist.

For more information, speak to your doctor, pharmacist, or PAH specialist, or visit the official PBS or TGA websites for updated clinical guidance.