P Force (Sildenafil Citrate) – Patient Information for Australia
Basic Product Information
| International Non-proprietary Name (INN): | Sildenafil Citrate |
| Australia Brand Names: | P Force, Viagra, Silvasta, Vedafil |
| ATC Code: | G04BE03 |
| Available Forms and Strengths: | Oral tablets: 25 mg, 50 mg, 100 mg |
| Manufacturers: | Sun Pharma, Pfizer Australia, generic manufacturers |
| Prescription Status: | Prescription only (S4, Schedule 4 Medicine in Australia) |
Mechanism of Action
- For patients: Sildenafil works by relaxing the muscles in blood vessels in the penis, increasing blood flow and helping to achieve and maintain an erection during sexual stimulation.
- For specialists: Sildenafil selectively inhibits cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5), increasing cGMP levels in corpus cavernosum, leading to smooth muscle relaxation and enhanced erectile response to nitric oxide.
Pharmacokinetics
- Absorption: Rapid oral absorption; peak plasma concentrations reached within 30–120 minutes (median 60 minutes).
- Metabolism: Hepatic, primarily via CYP3A4 (major route) and CYP2C9 (minor).
- Elimination: Mainly via faeces (80%), urine (13%). Terminal half-life about 3–5 hours.
- Duration of action: Effect lasts up to 4–6 hours after dosing.
Use in Everyday Life and Best Practices (Australia Context)
- Typical Doses: Most adults start with 50 mg about 1 hour before sexual activity; may be adjusted to 25 mg (if needed) or up to 100 mg (maximum recommended dose).
- Tablets should be swallowed whole with water.
- Do not use more than one dose in 24 hours.
- P Force is only effective with sexual stimulation; it does not cause an erection on its own.
- Discuss use with your GP, especially if on other medications or with chronic diseases (diabetes, hypertension, cardiac disease).
- Prescriptions are required from a registered Australian prescriber (GP, urologist).
Dosing in the Morning vs Evening
- Evening (most common): Preferred as sexual activity typically occurs in the evening/at night.
- Morning: Can be used if sexual activity is planned earlier; do not exceed one dose per 24 hours.
- Tips for Regularity: Always allow at least 24 hours between doses. Plan ahead if needed for intimacy in different times of day.
- Advantage: Maximum flexibility and spontaneity.
- Disadvantage: Less effective if unplanned or used too close to previous dose.
Taking with Food or on an Empty Stomach
- Food effect: High-fat meals (e.g., traditional Australian steak dinner, meat pies) can delay absorption and reduce the effect’s onset.
- For most reliable effects, take P Force on an empty stomach or with a light meal; avoid heavy or greasy foods shortly before use.
- Alcohol can impair erectile performance and increase risk of side effects (e.g., low blood pressure, dizziness).
Interaction Warnings
| Interaction | Risk/Advice |
|---|---|
| Nitrates (GTN spray, angina medicines) | Dangerous drop in blood pressure; do not use with any form of nitrate therapy. |
| Alpha-blockers (e.g., for prostate or high blood pressure) | Risk of symptomatic hypotension; consult your doctor for close monitoring. |
| Other PDE5 inhibitors (e.g., tadalafil, vardenafil) | Do not combine; risk of overdose and side effects. |
| Alcohol | Can worsen dizziness, headache, and lower blood pressure. |
| Certain antifungal/antiviral drugs (e.g., ritonavir, ketoconazole) | May raise sildenafil levels; dose adjustment and monitoring required. |
| Grapefruit juice | Can increase side effects by raising blood levels of sildenafil—avoid using together. |
Indications
| Indication | Status | Comments |
|---|---|---|
| Erectile dysfunction (ED) in adult males | Approved | Main and official use in Australia |
| Pulmonary arterial hypertension (PAH) | Approved (as Revatio, different dose/formulation) | Specialist prescription, not under P Force brand |
| Female sexual arousal disorder | Off-label (not recommended) | Lack of consistent evidence, not PBS reimbursed |
Dosing According to Clinical Indications
| Indication | Adults | Elderly (>65y) | Children |
|---|---|---|---|
| ED (most patients) | 50 mg once, 1 hour before sex; adjust to 25–100 mg as needed | Start at 25 mg, titrate with caution | Not recommended |
| Severe hepatic/renal impairment | 25 mg (first dose, use caution) | Same as above | Not recommended |
| Pulmonary arterial hypertension | 20 mg three times daily (specialty product only) | As per adult dose | Specialist care only |
Safety Profile and Side Effects
| Frequency | Side Effects | Comments/Warnings |
|---|---|---|
| Common (>1%) | Headache, flushing, nasal congestion, indigestion, dizziness, visual changes (blue/blurred vision) | Usually mild and temporary |
| Uncommon (<1%) | Rash, muscle pain, shortness of breath, palpitations | Report if persistent or concerning |
| Rare | Prolonged erection (>4 hours, priapism), sudden hearing loss, severe vision loss, allergic reaction | Seek urgent medical attention |
| Very rare | Heart attack, stroke (mainly in high-risk patients) | Discuss with doctor if history of cardiovascular disease |
Guidelines for Proper Use (Pharmacist/Clinic Advice, Australia Conditions)
- Obtain a prescription from your Australian GP or specialist before purchasing.
- Purchase only from registered pharmacies—never from unverified online sources.
- Discuss your cardiac, liver, kidney health, and medication use with your doctor to ensure safety.
- Take tablets whole with a glass of water, about 1 hour before planned sexual activity.
- Do not exceed one dose per 24 hours. If a dose fails, do not double the next dose.
- Monitor for any new symptoms (chest pain, severe dizziness, visual disturbances) and seek prompt medical care if needed.
- Store at room temperature (below 25°C); keep out of reach of children.
- Travelling? Carry your prescription and original packaging, especially if travelling overseas where regulatory status may differ.
- Discuss with your doctor if you experience persistent side effects or if the medicine does not work as expected.
Alternative Treatment Options for Erectile Dysfunction (Australia, PBS Drugs)
- Tadalafil (Cialis): Longer action (up to 36 hrs), suitable for more spontaneous or frequent sexual activity; may cause muscle aches; can be used daily, but cost may be higher.
- Vardenafil (Levitra): Similar short action as sildenafil, may have fewer visual side effects; less affected by fatty foods.
- Avanafil (not PBS-listed): Rapid onset (~15 mins), shorter duration; more expensive, less widely available.
- Non-pharmacological: Vacuum erection devices, penile implants, psychotherapy/counselling (when psychological factors predominate).
All oral PDE5 inhibitors require a prescription in Australia. Some are subsidised on the Pharmaceutical Benefits Scheme (PBS) for specific conditions and populations (e.g. post-prostatectomy patients).
Legal, Registration, and Reimbursement Status in Australia
- Therapeutic Goods Administration (TGA) approval: Yes, sildenafil citrate is on the Australian Register of Therapeutic Goods (ARTG).
- Schedule: S4 (Prescription Only Medicine) under the Poisons Standard; cannot be purchased legally without prescription.
- PBS reimbursement: Limited—eligible for some patients under specific criteria. Discuss with your GP or pharmacist for availability and cost supports.
- Not available as an over-the-counter (OTC) drug in Australia.
Latest Research and Clinical Guidance (2022–2025)
- Updated ED management: 2023 Australian guidelines reinforce the first-line status of PDE5 inhibitors for erectile dysfunction, with lifestyle modification, psychological support, and cardiovascular risk screening recommended (Australasian Society of Sexual Medicine, 2023).
- Combination therapies: Recent reviews (BMJ 2023, Urology 2024) suggest limited additional benefit and increased side-effect risk from combining agents.
- Cardiovascular risk: Real-world Australian studies (Int J Cardiol 2024) confirm safety in most men without significant cardiovascular disease, but screening is essential before prescribing.
- Ageing population: ED medication use is safe and effective in older men; dosing adjustments for hepatic or renal impairment may be necessary (Therapeutics & Clinical Risk Management, 2023).
- Non-invasiveness: Oral agents like P Force remain the preferred initial treatment, with invasive options reserved for non-responders (Urology Australia, 2025 Guidance).
Availability and Delivery
| Pack Size | No. of Tablets | Indicative Price Range (AUD, April 2024) |
|---|---|---|
| Small | 4 | $19–$29 |
| Medium | 12 | $52–$72 |
| Large | 28 | $110–$148 |
| Delivery Location | Standard Delivery Time (days) | Express Delivery Time (days) |
|---|---|---|
| Sydney, Melbourne, Brisbane | 1–2 | Same day–1 |
| Adelaide, Perth, Hobart | 2–3 | 1–2 |
| Regional and remote areas | 3–7 | 2–4 |
Frequently Asked Questions (FAQ)
- Do I need a prescription for P Force in Australia?
Yes, all sildenafil tablets—including P Force—require a prescription from a licensed Australian healthcare provider. - How soon before sex should I take P Force?
Take 30–60 minutes before anticipated sexual activity; it starts working within about 1 hour and lasts up to 4–6 hours. - Can I drink alcohol with P Force?
Limit alcohol to reduce risk of side effects; heavy drinking can reduce effectiveness and increase risk of low blood pressure and dizziness. - What if P Force does not work for me?
Speak to your doctor about adjusting the dose, changing medicines, or assessing for underlying physical or psychological issues. Do not increase the dose without medical advice. - Is it safe to buy erectile dysfunction medicines online?
Only purchase from registered Australian pharmacies. Avoid sites that do not require a prescription, as counterfeit and unsafe products are common.
