Revatio (Sildenafil Citrate) — Patient Information (Australia)

Revatio is a medicine containing sildenafil citrate. It is used to treat certain types of pulmonary arterial hypertension (PAH)—a condition where blood pressure in the lungs is higher than normal, making it harder for the heart to pump blood effectively.

This information is written in a patient-friendly way to help you understand how Revatio works, how it is usually taken, what to watch for, and what to consider with other medicines and alcohol. Always follow the advice given by your healthcare professional and the directions on your medicine label.

Quick overview

• Medicine: Revatio (sildenafil citrate)
• Used for: Pulmonary arterial hypertension (PAH)
• How it works: Improves blood flow in the lungs by relaxing blood vessels
• Common form: Tablets (strength depends on your product)
• Key cautions: Do not take with nitrates or “poppers” (amyl nitrite/amyl nitrite-like products); be careful with medicines that affect blood pressure or the liver
• Common side effects: Headache, flushing, indigestion, dizziness

Basic product information

Revatio (sildenafil citrate) belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. It helps to reduce pressure in the pulmonary arteries and can improve exercise capacity and symptoms in people living with PAH.

Strength and pack size: These vary by product. Check the label on your specific brand/strength for exact details.

What it does not treat: Revatio is specifically used for pulmonary arterial hypertension. Other sildenafil-containing products may have different approved uses and dosing regimens.

How Revatio works (mechanism of action)

In PAH, blood vessels in the lungs become narrowed and stiff. This raises blood pressure in the pulmonary circulation, which increases strain on the heart.

Revatio works by:

• Blocking PDE5: Sildenafil inhibits PDE5, an enzyme that breaks down cyclic guanosine monophosphate (cGMP).
• Increasing cGMP: Higher cGMP levels help relax smooth muscle in blood vessel walls.
• Vasodilation: Blood vessels in the lungs widen (dilate), which can lower pulmonary artery pressure and improve blood flow.

Important: While the blood vessels relax, Revatio can also affect blood pressure in some people—especially when combined with certain other medicines.

Pharmacokinetics (how the body handles Revatio)

Pharmacokinetics describes what the body does to a medicine—how it is absorbed, distributed, metabolised, and excreted.

• Absorption: Sildenafil is absorbed after oral dosing. Peak levels typically occur within a few hours (often around 1–2 hours in general use, but individual timing varies).
• Distribution: Sildenafil spreads throughout the body and binds to plasma proteins.
• Metabolism: It is mainly metabolised in the liver (primarily by CYP3A4).
• Elimination: Metabolites are cleared mainly via the liver and kidneys.
• Half-life: The effective half-life is commonly described as several hours (often around ~4 hours), which is part of why dosing is commonly taken more than once per day for PAH.

Why this matters: Medicines that inhibit CYP3A4 (for example, some antifungals or antibiotics) can raise sildenafil levels and side effects. Medicines that induce CYP3A4 can reduce effectiveness.

Typical use and indications in Australia

Revatio is used for the treatment of pulmonary arterial hypertension (PAH). It may be prescribed in:

• Adults with PAH (as determined by your clinician)
• Sometimes combination regimens with other PAH therapies (depending on the severity of disease and your treatment plan)

Indications can vary by local product information. Your pharmacist or healthcare professional can confirm that Revatio is intended for your diagnosis and treatment goals.

How to take Revatio: dosing, timing, and duration

Always follow the dosing instructions provided for you. PAH is a long-term condition and treatment plans are individual. Do not change your dose unless your prescriber advises you to.

Typical dosing approach (general guidance)

For PAH, sildenafil is often taken multiple times per day rather than as a single daily dose. Your label will tell you the exact dose and schedule.

• Dose frequency: Usually divided across the day (commonly three times daily, though your product label will specify your regimen).
• Consistency: Try to take doses at similar times each day.
• Do not double up: If you miss a dose, take it when you remember unless it is near the time of the next dose. Avoid taking extra tablets to make up the missed dose.

Timing tips

• Choose a routine: Tie doses to daily activities (e.g., morning, mid-afternoon, evening).
• Be mindful of effects: Some people notice headache, flushing or dizziness soon after a dose.
• Plan for first days: If you’re starting Revatio, consider arranging a day with easier activity until you know how you respond.

Duration of use

PAH treatment is often long term. Stopping suddenly can lead to worsening symptoms. If you’re considering stopping, discuss it with your healthcare professional first.

Food interactions and what to eat

Food generally has less impact on sildenafil than some other medicines, but certain meals can affect how quickly you absorb it.

• With meals: Taking Revatio with food may slightly affect absorption rate for some people.
• How to take: If your clinician or label does not specify, taking it consistently with or without food may help you maintain predictable effects.
• Grapefruit & related products: Grapefruit can inhibit CYP3A4 and may increase sildenafil levels. It is safer to avoid grapefruit unless your pharmacist advises otherwise.

If you experience nausea or indigestion: Consider taking the medicine after food (if approved for your regimen) and discuss persistent symptoms with your pharmacist.

Alcohol interactions: safety considerations

Alcohol can affect blood vessels and blood pressure. While moderate alcohol may be tolerated by some people, combining alcohol with sildenafil may increase the chance of:

• Dizziness or light-headedness
• Lower blood pressure (especially if you already have low blood pressure or take other blood pressure-lowering medicines)
• Headache and flushing

Practical advice:

• Start by avoiding alcohol until you know how you respond to Revatio.
• If you do drink, keep it minimal and avoid dehydration.
• Seek medical advice if you have episodes of fainting, severe dizziness, or chest pain.

Medicine interactions (important)

Some interactions can be dangerous. In particular, medicines that contain nitrates can cause a severe drop in blood pressure when combined with sildenafil.

Do not combine with nitrates

Revatio must not be taken with:

• Nitrate medicines used for angina (e.g., glyceryl trinitrate/nitroglycerin, isosorbide dinitrate, isosorbide mononitrate)
• “Poppers” (amyl nitrite, and similar products)

Reason: The combination can lead to a significant blood pressure fall and can be life-threatening.

Use caution with blood pressure medicines

• Alpha-blockers (used for prostate symptoms or blood pressure)
• Other vasodilators or PAH medicines that lower blood pressure
• Antihypertensives in general

Your clinician may adjust doses or timing to reduce the risk of dizziness or fainting.

CYP3A4 inhibitors (can increase sildenafil levels)

Some medicines can raise sildenafil exposure and side effects. Examples include:

• Some antifungals (e.g., ketoconazole, itraconazole—depending on availability)
• Some antibiotics (e.g., clarithromycin, telithromycin—depending on your medicines)
• Some HIV protease inhibitors

CYP3A4 inducers (can reduce sildenafil levels)

These can make sildenafil less effective, for example:

• Rifampicin
• Some anticonvulsants (e.g., carbamazepine, phenytoin, phenobarbital)
• St John’s wort (herbal supplement)

Other PAH therapies

Revatio may be used alongside other PAH treatments (for example, prostacyclin analogues, endothelin receptor antagonists, or other vasodilators) depending on your plan. Because combinations can affect blood pressure, monitoring is important.

Always tell your pharmacist

Before starting Revatio, and whenever you add a new medicine, tell your pharmacist about:

• All prescription medicines
• Over-the-counter medicines
• Herbal products and supplements
• Any history of low blood pressure or fainting
• Any liver problems or kidney problems

Safety profile: side effects and when to seek help

Like all medicines, Revatio can cause side effects. Many are mild and improve as your body adjusts. However, some symptoms require urgent medical attention.

Common side effects

• Headache
• Flushing (warmth/redness)
• Indigestion / dyspepsia
• Dizziness
• Nasal congestion
• Nausea

Less common but important effects

• Visual disturbances (e.g., blurred vision, changes in colour perception)
• Changes in heart rate or palpitations
• Low blood pressure symptoms such as light-headedness or fainting

Seek urgent medical help if you experience

• Chest pain or symptoms of a severe allergic reaction (swelling of face/lips, difficulty breathing, hives)
• Fainting or severe dizziness
• Sudden vision loss or sudden severe eye pain
• Signs of a serious cardiovascular event (e.g., severe shortness of breath, collapse)

Note: Do not “wait and see” if symptoms are severe or rapidly worsening.

Who needs extra caution

• People with low blood pressure
• People with serious liver impairment
• People with significant kidney impairment
• People taking medications that interact with sildenafil (especially nitrates, strong CYP3A4 inhibitors)
• Those with a history of heart rhythm problems or certain cardiovascular conditions

Practical use tips for daily life

• Keep a medication schedule: Use a phone alarm or pill organiser to reduce missed doses.
• Hydrate appropriately: Dehydration can worsen dizziness, particularly if your blood pressure is lower than usual.
• Be careful when standing: If you feel light-headed, rise slowly from sitting or lying down.
• Track your symptoms: Note changes in breathlessness, exercise tolerance, flushing/headaches, and any side effects. This can help your clinician fine-tune your plan.
• Avoid grapefruit: It may increase sildenafil levels.
• Inform other clinicians: If you attend hospital or see another specialist, mention you’re taking sildenafil for PAH.
• Keep an updated medicines list: Include prescription and non-prescription products.

Alternative options (other treatments for PAH)

PAH management can include several medicine types. Alternatives may be considered based on disease severity, response, and tolerance.

Medication classes that may be used in PAH

• Endothelin receptor antagonists (reduce effects of endothelin)
• Prostacyclin pathway therapies (e.g., prostacyclin analogues or receptor agonists)
• Soluble guanylate cyclase stimulators (increase cGMP via different pathways)
• Other PDE5 inhibitors (depending on indication and approved products)

Important: Do not switch PAH medicines without clinician guidance. Different drugs can have different dosing schedules and interaction profiles.

If you are interested in alternatives, ask your pharmacist or specialist which options are appropriate for your PAH type and current regimen.

Australia: market and legal context (high-level)

In Australia, medicines are regulated to ensure quality, safety and appropriate supply. Availability and prescribing rules depend on the product and indication. Your local pharmacy will be able to confirm what is appropriate for your situation, including whether you receive Revatio as part of your PAH management plan.

Important note: Ensure you obtain medicines from legitimate sources. Counterfeit or unapproved products may be unsafe and may not match the stated ingredients or strength.

Recent guidance: Guidance for PAH treatment may evolve over time. Australian clinical practice typically involves specialist oversight and regular review of response, side effects and drug interactions—especially for medicines that affect blood pressure and lung circulation.

Delivery and availability (online pharmacy guidance)

Online pharmacies in Australia may offer delivery options for eligible medicines. Availability can vary by:

• Stock levels at the time of ordering
• Selected strength and pack size
• Eligible supply process required for that medicine

What to check before ordering:

• Your chosen product matches the correct strength on your label.
• You order the correct quantity for your dosing schedule (e.g., for one month supply if that is your plan).
• Delivery address details are correct to avoid delays.
• You understand the expected dispatch/delivery timeframe.

Storage: Store tablets according to the directions on the pack (typically at room temperature, protected from moisture and out of reach of children).

FAQ

1) Is Revatio the same as sildenafil for erectile dysfunction?

Revatio contains sildenafil citrate, but the approved use and dosing schedule differ. Revatio is used for pulmonary arterial hypertension (PAH) and is not interchangeable with all other sildenafil products. Always use the product and regimen specifically intended for you.

2) How quickly does Revatio work?

Some people notice symptom changes (such as improved exercise tolerance) over time rather than immediately. Blood vessel relaxation may occur after each dose, but overall benefit in PAH usually depends on sustained treatment and disease status.

3) What should I do if I miss a dose?

Take it when you remember unless it is close to the next dose. Do not take double doses. If you’re unsure, contact your pharmacist for advice based on your dosing schedule.

4) Can I take Revatio with food?

Many people can take Revatio with or without food. If food affects your comfort or timing, aim to take it consistently in the way you and your clinician have advised.

5) Can I drink alcohol while taking Revatio?

Alcohol may increase the risk of dizziness or blood pressure changes. Keep alcohol to a minimum, avoid dehydration, and seek advice if you experience fainting, severe dizziness, or worsening symptoms.

6) What medications should I avoid?

Do not combine Revatio with nitrates or “poppers”. Use caution with medicines that affect blood pressure or interact with CYP3A4. Always check with your pharmacist if you’re starting, stopping or changing any medicine.

7) Are there any dietary products I should avoid?

Grapefruit and related products may increase sildenafil levels. Avoid or discuss with your pharmacist if you regularly consume grapefruit.

8) What if I feel light-headed after taking my dose?

Sit or lie down immediately and avoid sudden standing. Light-headedness can be a sign of blood pressure changes, especially when combined with other medicines or alcohol. If it persists, consult your clinician or pharmacist.

9) When should I seek urgent help?

Seek urgent medical help for severe symptoms such as fainting, chest pain, trouble breathing, sudden vision loss, or signs of a serious allergic reaction.

10) What can I do to reduce side effects?

You can:

• Take doses at consistent times
• Rise slowly from sitting/lying positions
• Stay hydrated and manage triggers for headache (e.g., dehydration)
• Discuss persistent side effects with your pharmacist or healthcare professional—dose adjustments may be possible depending on your situation

Product details at a glance

Need personalised advice? If you have questions about whether Revatio is appropriate for you, how to take it, or whether it interacts with your other medicines, speak with your pharmacist or healthcare professional.