Revatio (Sildenafil Citrate) — Patient Information (Australia)

Revatio contains sildenafil citrate, a medicine used to treat certain types of pulmonary hypertension. This page explains how Revatio works, when it’s typically taken, what to expect, important safety information, and practical tips to help you use it effectively.

This information is designed to be patient-friendly and should be read alongside the product packaging and advice from healthcare professionals.

Quick product overview

What is Revatio?

Revatio is a brand of sildenafil citrate. Sildenafil belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. In PAH, it helps reduce the resistance in the lungs’ blood vessels so the heart can pump more easily.

Revatio is a medicine used for people with pulmonary arterial hypertension (PAH). It may be used alone or alongside other treatments for PAH, depending on your treatment plan.

How Revatio works (mechanism of action)

In PAH, the blood vessels in the lungs become narrowed and less able to relax. Sildenafil works by enhancing the body’s natural pathway for relaxing blood vessels:

• The lining of blood vessels releases nitric oxide, which increases levels of cGMP.
• PDE5 normally breaks down cGMP.
• Sildenafil inhibits PDE5, which helps cGMP remain active longer.
• This leads to relaxation of pulmonary blood vessels and improved blood flow through the lungs.
• The result may be improved ability to exercise and reduced symptoms over time.

Importantly, sildenafil does not “cure” PAH, but it can improve symptoms and help manage the condition.

Pharmacokinetics (how the body processes it)

Understanding how the body absorbs and eliminates sildenafil can help explain timing, duration, and interactions.

• Absorption: Sildenafil is absorbed after taking a tablet. Peak levels generally occur after about 30–120 minutes, though timing varies by person.
• Distribution: Sildenafil binds to plasma proteins and distributes throughout the body.
• Metabolism: Sildenafil is primarily metabolised by liver enzymes, especially CYP3A4.
• Elimination: The body clears sildenafil mainly through metabolism and subsequent excretion. The terminal elimination half-life is commonly around 3–5 hours.
• Effect of liver/kidney impairment: Reduced liver or kidney function may increase sildenafil exposure, which can increase the risk of adverse effects. Your prescriber may adjust dosing.

What is Revatio used for?

Revatio is used for the treatment of pulmonary arterial hypertension (PAH) to:

• Improve exercise capacity
• Reduce symptoms related to PAH
• Support overall PAH management as part of combination therapy when appropriate

PAH is a specific form of pulmonary hypertension. Revatio is intended for PAH and is not for every type of high blood pressure in the lungs.

Typical dosing and how to take it

Dosing depends on your individual diagnosis, overall treatment plan, and how you respond to the medicine. Always follow the dosing schedule provided with your medicine or by your healthcare team.

General guidance for timing

• Take Revatio at the times you have been prescribed, typically multiple times daily.
• Try to take doses at roughly even intervals where possible.
• If you miss a dose, take it when you remember unless it’s close to the next dose. Do not double the dose.

How to take Revatio tablets

• Swallow the tablet with water.
• You may take it with or without food (see the food section below for more detail).
• Keep taking it consistently; PAH management often relies on ongoing therapy.

Onset and expected timing of effect

Many people begin to notice benefit within the first hours after a dose, but PAH improvements can be gradual. Longer-term benefits may take weeks of consistent treatment. If you have concerns about whether Revatio is working, speak with your healthcare professional.

Food interactions (including “with meals”)

Food can influence absorption for some people. In general:

• Revatio can often be taken with or without food.
• A heavy or high-fat meal may delay the time to peak effect for sildenafil (you may feel the effect a bit later).
• The overall effect may be similar, but timing could shift.

A consistent routine can help you understand how the medicine works for you. If you notice timing changes with meals, discuss this with your healthcare provider.

Alcohol and medicine interactions

Alcohol

Alcohol may worsen certain side effects such as dizziness, lightheadedness, or low blood pressure. Because sildenafil can affect blood flow and may lower blood pressure in some circumstances, it’s generally best to:

• Limit alcohol
• Avoid heavy drinking
• Be cautious if you stand up quickly

Important medicine interactions

Sildenafil interactions are clinically important. Some medicines can increase sildenafil levels or increase the chance of dangerous low blood pressure.

Medicines to avoid (key examples)

• Nitrates (for angina/heart pain), including:
  • glyceryl trinitrate (GTN)
  • isosorbide mononitrate/dinitrate

  The combination can cause a significant drop in blood pressure.

• Guanylate cyclase stimulators such as riociguat (for PAH)

  This combination is generally contraindicated due to the risk of low blood pressure.

• PDE5 inhibitors (other sildenafil/tadalafil/vardenafil) taken at the same time unless specifically directed.

Medicines that may increase sildenafil levels

Sildenafil is metabolised by CYP3A4. Drugs that inhibit this pathway may raise sildenafil exposure, increasing side effects. Examples include:

• Some antifungals (e.g., ketoconazole, itraconazole)
• Some antibiotics (e.g., clarithromycin)
• HIV protease inhibitors (e.g., ritonavir-containing regimens)
• Some medicines used for hepatitis C (depending on regimen)

Medicines that may reduce sildenafil levels

Medicines that induce CYP3A4 may lower sildenafil concentrations, potentially reducing effectiveness. Examples include:

• Some anticonvulsants (e.g., carbamazepine, phenytoin, phenobarbital)
• Rifampicin-based antibiotics
• St John’s Wort (Hypericum perforatum)

Blood pressure medicines

If you take medicines that lower blood pressure (antihypertensives), the combination with sildenafil may increase the chance of hypotension (low blood pressure), dizziness, or fainting. Your clinician may monitor your response and adjust treatment.

Always tell your healthcare professional about all medicines you take, including non-prescription products, vitamins, and herbal preparations.

Safety profile and side effects

Like all medicines, Revatio can cause side effects. Many are mild and temporary, but some require urgent medical attention.

Common side effects

• Headache
• Flushing (warmth/redness)
• Dyspepsia or stomach discomfort
• Nasal congestion
• Dizziness
• Visual disturbances (such as a bluish tint) in some people

Less common but important side effects

• Low blood pressure symptoms (lightheadedness, fainting)
• Palpitations (feeling of rapid heartbeat)
• Rash or allergy-type reactions

Seek urgent medical help if you have

• Chest pain or severe shortness of breath that is new or worsening
• Severe dizziness, collapse, or fainting
• Signs of a serious allergic reaction: swelling of the face/lips, difficulty breathing, hives
• Sudden vision loss or severe eye pain (rare, but needs immediate attention)

Priapism (rare)

PDE5 inhibitors (including sildenafil) are known to be associated with priapism—a prolonged, painful erection— though this is more relevant to sildenafil uses in other indications. If a prolonged erection occurs (particularly lasting more than 4 hours), seek urgent medical care.

Practical use tips for better outcomes

• Keep a simple schedule: Use alarms or a medication reminder to maintain consistent dosing.
• Track how you feel: Note changes in breathlessness, ability to walk, or exercise tolerance. This helps clinicians review whether therapy is working.
• Stand up slowly: If you feel lightheaded, change positions gradually.
• Be careful with “heart pain” medicines: Do not use nitrate medicines with sildenafil. If you have angina, discuss an emergency plan with your healthcare team.
• Avoid grapefruit products: Grapefruit and some grapefruit juices can inhibit CYP3A4 in some people, potentially increasing sildenafil exposure.
• Report new medications: Before starting any antibiotic, antifungal, antiviral, or herbal product, ask your pharmacist or clinician about interactions.

Alternative options

PAH is managed using different classes of medicines depending on severity, cause, and response. If Revatio isn’t suitable or doesn’t control symptoms enough, clinicians may consider alternatives. These can include:

Other medicines for PAH

• Other PDE5 inhibitors (e.g., tadalafil) — selection depends on suitability and dosing schedules.
• Endothelin receptor antagonists (e.g., bosentan, ambrisentan)
• Prostacyclin pathway therapies (e.g., epoprostenol, treprostinil, iloprost; and oral options in some regimens)
• Guanylate cyclase stimulators (e.g., riociguat) — but not with sildenafil due to interaction risks.

The best option depends on the type of PAH, your overall health, and how your body responds to treatment. Always speak to a healthcare professional before switching.

Market and legal context for Australia

In Australia, medicines are supplied according to regulatory requirements and prescribing rules. PAH therapies are typically managed within specialist care.

Pharmacy supply and online availability must align with:

• Australian medicine scheduling and regulatory standards
• Brand and generic product availability (where permitted)
• Patient identification and lawful dispensing processes
• Quality and integrity of the supply chain

If you are purchasing online, use reputable providers who verify product legitimacy and follow Australian pharmacy requirements.

Recent guidance (what matters for patients)

PAH management guidance continues to emphasise several practical points that affect how sildenafil is used:

• Confirm the PAH type: Sildenafil is intended for PAH (pulmonary arterial hypertension), not all causes of pulmonary hypertension.
• Review interactions regularly: Many serious interactions relate to blood pressure and the nitric oxide pathway.
• Combination therapy may be needed: Some patients require more than one PAH medicine to achieve goals.
• Monitor response over time: Exercise capacity, symptoms, and clinical markers guide whether therapy is effective.
• Consider specialist follow-up: PAH usually requires ongoing review by clinicians experienced in the condition.

If you have questions about whether Revatio remains the right treatment for your situation, speak with your healthcare team.

Delivery and availability (Australia)

Availability can vary by supplier and stock levels. When ordering online, you can typically expect:

• Standard and express delivery options depending on your location
• Dispatch times that depend on stock confirmation and payment processing
• Discreet packaging to help protect privacy

To reduce the risk of running out, consider ordering ahead of time, especially if you take Revatio regularly.

FAQ

1) How long does Revatio take to work?

Many people begin to notice effects within 30–60 minutes after a dose, though timing can vary. In PAH, overall improvement in symptoms and exercise capacity may build over weeks.

2) Can I take Revatio with food?

Generally, yes. If you eat a heavy meal, the onset may be delayed. Keeping your routine consistent can help you predict when you’ll feel the effect.

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

Take it when you remember unless it’s almost time for your next dose. Do not take a double dose to make up for a missed tablet. If you miss several doses, contact your healthcare professional for advice.

4) Are there foods or drinks I should avoid?

Grapefruit products may affect sildenafil levels in some people, so it’s often best to avoid them. Also consider limiting alcohol, as it may worsen dizziness or lower blood pressure.

5) Can I take nitrates (for angina) with Revatio?

No. Nitrates can cause a dangerous blood pressure drop when used with sildenafil. If you have angina, discuss an emergency plan with your clinician before taking Revatio.

6) What other medicines interact with Revatio?

Some key interaction groups include:

• Nitrates and riociguat (avoid combination)
• Medicines that inhibit or induce CYP3A4 (may change sildenafil levels)
• Blood pressure–lowering medicines (may increase risk of low blood pressure)

Always check with a pharmacist if you’re unsure about any medicine, including over-the-counter products and herbal supplements.

7) What side effects are most common?

Common side effects include headache, flushing, nasal congestion, indigestion, and dizziness.

8) When should I stop taking Revatio and seek help?

Do not stop Revatio without medical advice. However, seek urgent medical care if you experience severe dizziness/fainting, signs of serious allergic reaction, chest pain, severe shortness of breath, sudden vision changes, or other severe symptoms.

9) Can Revatio be used by everyone with pulmonary hypertension?

No. Revatio is specifically used for pulmonary arterial hypertension (PAH). Pulmonary hypertension has many causes, so the diagnosis and treatment choice must be confirmed by clinicians.

10) Is Revatio the same as sildenafil used for erectile dysfunction?

Sildenafil is the same active ingredient, but Revatio is used for PAH and is typically prescribed with different dosing goals and safety considerations. Do not swap products or use sildenafil for a different purpose without professional guidance.

Important reminders

• Keep a list of your medicines (including herbal products) and review it with your pharmacist or clinician.
• Do not use sildenafil with medicines that contain nitrates unless specifically directed by a healthcare professional.
• If you experience troubling side effects, contact your healthcare team promptly.
• Store tablets according to the instructions on the packaging and keep them out of reach of children.

If you have any questions about Revatio, your treatment plan, or interactions, speak to a healthcare professional or pharmacist.