Fildena Strong (Sildenafil Citrate): Patient-Friendly Information for Australian Patients
Basic Product Information
| International Non-proprietary Name (INN) | Sildenafil Citrate |
|---|---|
| Australia Brand Names |
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| ATC Code | G04BE03 |
| Available Forms & Strengths |
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| Manufacturers |
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| Prescription Status (Australia) | Prescription only medicine (Schedule 4, S4) |
Mechanism of Action
In simple terms: Sildenafil Citrate helps men with erectile dysfunction (ED) achieve and maintain an erection by increasing blood flow to the penis during sexual stimulation. It works by relaxing blood vessels and improving circulation in the genital area, which makes it easier to get and keep an erection.
For specialists: Sildenafil is a potent and selective inhibitor of cyclic guanosine monophosphate (cGMP)–specific phosphodiesterase type 5 (PDE5). By blocking PDE5 in the corpus cavernosum, sildenafil increases cGMP levels, facilitating smooth muscle relaxation and vasodilation upon sexual stimulation.
Pharmacokinetics
- Absorption: Well-absorbed after oral administration. Peak plasma concentration reached in 30–120 minutes (median ~60 minutes).
- Metabolism: Primarily metabolised by the liver enzymes CYP3A4 (major route) and CYP2C9 (minor route).
- Elimination: Mainly via faeces (80%) and urine (13%). Terminal half-life is approximately 4 hours.
- Duration of action: 4–6 hours of maximal effect, with some residual action up to 8 hours.
Use in Everyday Life and Best Practices (Australia Context)
- Indication: First-line oral therapy for erectile dysfunction in adult males.
- Typical Patient Profile: Men aged 18+ experiencing difficulty achieving or sustaining an erection.
- How to Use: Take the prescribed dose (commonly 50 mg or 100 mg) about 60 minutes before planned sexual activity. Do not exceed one dose within 24 hours.
- Australian Practice Tips: Consult your GP for a full assessment before starting treatment. Discuss any chronic illnesses (heart, liver, or kidney disease) and all other medications you are taking.
- Psychological Support: Consider seeing a sexual health specialist or psychologist if underlying anxiety or relationship factors are present.
Dosing in the Morning vs Evening
- Morning Dosing: Useful for planned, morning intimacy. Slightly greater risk of headaches if taken on an empty stomach, but often more convenient for certain lifestyles.
- Evening Dosing: Most commonly prescribed. Allows flexibility for spontaneous activity in the evening hours.
- Tip: Aim for consistent usage times if using regularly, but daily use is not recommended for all patients. Discuss a routine with your GP.
Taking with Food or on an Empty Stomach
Food can slow down the absorption of sildenafil and delay its onset of action by about 30–60 minutes. High-fat meals, typical of many Australian diets (e.g., meat pies, fish and chips), may further decrease its effectiveness. For best results, take sildenafil on an empty stomach or after a light low-fat meal.
- With Food: Onset may be slower, but some patients find it gentler on the stomach.
- On an Empty Stomach: Faster and stronger effect, but may cause more pronounced side effects (headache, flushing).
- Australian Eating Habits: Consider timing your dose during dinner parties, BBQs, or events. Avoid very high-fat meals before planned use.
Interaction Warnings
| Substance or Factor | Interaction Effect |
|---|---|
| Alcohol | Can worsen dizziness, headache, and lower blood pressure; best to limit or avoid alcohol when using sildenafil. |
| Nitrates (GTN, isosorbide, etc.) | Potentially dangerous drop in blood pressure — never combine. |
| Alpha-blockers (e.g. doxazosin) | May cause severe hypotension; use with caution and spaced doses. |
| Grapefruit or grapefruit juice | Can increase plasma sildenafil levels, leading to more side effects. |
| Strong CYP3A4 inhibitors (e.g. ketoconazole, ritonavir) | Increase sildenafil levels; dose adjustment may be needed. |
| Other ED drugs (e.g. tadalafil, vardenafil) | Increases risk of side effects, priapism; do not combine treatments. |
| Some antihypertensives | Monitor blood pressure and discuss with your doctor prior to use. |
Indications
| Indication | Registration Status | Notes |
|---|---|---|
| Erectile Dysfunction (ED) | Registered / PBS-listed (Viagra, generics) | First-line oral therapy for adult males |
| Pulmonary Arterial Hypertension | Registered (brands: Revatio) | Specialist use only |
| Off-label use in women with sexual dysfunction | Not registered/Not PBS-listed | Limited evidence, not standard of care in Australia |
| Other circulatory disorders (e.g. Raynaud’s) | Off-label | Specialist consideration only |
Dosing According to Clinical Indications
| Group/Indication | Starting Dose | Typical Range | Maximum Frequency |
|---|---|---|---|
| Adults (ED) | 50 mg (usually 1 hour before intercourse) | 25–100 mg | Once per 24 hours |
| Elderly (>65 years) | 25 mg | 25–50 mg | Once per 24 hours |
| Renal or hepatic impairment | 25 mg | 25–50 mg (cautious titration) | Once per 24 hours |
| Pulmonary Hypertension (Revatio) | 20 mg three times daily | Adjust by specialist | Dosing as per specialist recommendation |
| Pediatric (PAH only) | Not approved for ED; specialist use only in PAH | As directed by specialist | Specialist only |
Safety Profile and Side Effects
- Common Side Effects:
- Headache
- Facial flushing
- Indigestion (dyspepsia)
- Blocked nose (nasal congestion)
- Dizziness
- Blurred vision or changes in colour vision (blue tinge)
- Uncommon/Rare Side Effects:
- Palpitations or rapid heartbeat
- Prolonged or painful erection (priapism)
- Hearing loss, ringing in the ears
- Severe skin rashes
- Sudden loss of vision (very rare, urgent medical attention required)
- Warnings: Do not take if you use nitrates, have severe heart/liver problems, have recent stroke or heart attack, or are allergic to sildenafil. Caution in those with eye disorders.
Guidelines for Proper Use
- Only use as prescribed by a registered Australian healthcare provider.
- Take tablet with a full glass of water. Swallow whole, do not chew or crush.
- Allow at least 60 minutes for effect before sexual activity. Sexual stimulation is still required for effect.
- Do not use more than once daily. Do not share your tablets with others.
- If you experience chest pain, vision or hearing changes, or an erection lasting > 4 hours, seek medical attention.
- Store below 25°C in a dry place. Keep out of reach of children.
- For ongoing concerns, speak confidentially with your GP or men's health clinic. Telehealth consults are growing in availability across Australia.
Alternative Treatment Options
- Tadalafil (Cialis) – Longer duration of action (up to 36 hours), can be taken daily or as needed, but higher cost. PBS-subsidised for some indications.
- Vardenafil (Levitra, Vivanza) – Similar action and duration to sildenafil.
- Avanafil (Spedra) – Fastest onset, but not commonly PBS-listed; limited availability.
- MUSE Alprostadil Urethral Sticks – Effective but less convenient (invasive); reserved for those who do not respond to oral options.
- Vacuum Erection Devices, Injections, Psychosexual Therapy – Non-drug options for complex cases; recommended by men’s health specialists.
- Note: All options require assessment and a prescribed decision by a healthcare professional. Australian Pharmaceutical Benefits Scheme (PBS) subsidises some medications for genuine medical need.
Legal, Registration and Reimbursement Status in Australia
- Registered Product: Sildenafil (including Fildena Strong and generics) is registered with the Therapeutic Goods Administration (TGA).
- Legal Status: Prescription Only (Schedule 4/S4 medicine in the Poisons Standard 2023).
- PBS Status: Certain sildenafil products (e.g. Viagra and generics) PBS-listed for approved indications (ED due to organic causes, not for recreational use).
- Prescriber: GP, Urologist, Sexual Health Specialist or suitably qualified prescriber.
- Consumer Advice: Not available as an over-the-counter medicine or for online purchase without a valid prescription from an Australian-registered practitioner.
Latest Research and Clinical Guidance (2022–2025)
- 2022–2024 Clinical Updates: Recent Australian and international guidelines (AUA, EAU, RACGP) continue to reinforce sildenafil as first-line therapy for male ED, especially when combined with lifestyle, psychosexual, and relationship support (Nguyen et al., J Sex Med 2023; Osborne et al., Aust Prescr 2023).
- Safety: A 2023 TGA pharmacovigilance report found no new significant risks when used as directed; myocardial infarction and priapism remain rare but serious adverse events.
- Evolving Use: Extended dosing strategies (“on-demand” vs “daily low-dose”) remain area for personalised approaches, especially in chronic illness. Telemedicine and online prescribing models are on the rise but must comply with Australian legal frameworks (White et al., Med J Aust 2024).
- Female Sexual Dysfunction: Evidence remains inconclusive and not recommended by RACGP for female use outside research settings (Smith et al., Int J Impot Res 2024).
- PAH Use (Revatio): Studies (2022–2023, ERS/ATS) confirm safety and benefit for specialist-prescribed pulmonary hypertension treatment.
Availability and Delivery
| Pack Size | Number of Tablets | Indicative Price (AUD, private) | Delivery Times (Business Days) |
|---|---|---|---|
| Small | 4–8 tablets | $20–$40 | 1–2 (Sydney, Melbourne, Brisbane), 2–3 (Adelaide, Perth, Hobart), 3–5 (regional/remote) |
| Medium | 16–24 tablets | $60–$90 | 1–2 (metro), 2–4 (rural/remote) |
| Large | 32–48 tablets | $110–$150 | 1–2 (metro), up to 5 (NT, regional, WA remote) |
Always check with your pharmacy for current PBS coverage, supply chain status, and any valid prescription requirements.
FAQ – Common Patient Questions
- Does Fildena Strong (sildenafil) cause dependence or addiction?
No, sildenafil is not physically addictive. However, some men may develop psychological dependence if they use it as a ‘crutch’ for sexual confidence. Use as part of holistic care is recommended. - Can I drink alcohol with sildenafil?
Moderate alcohol may be tolerated but increases risk of dizziness, hypotension, and reduced effect. It’s safest to avoid drinking when taking sildenafil. - How long does Fildena Strong work for?
The effects usually last around 4 to 6 hours, although some men may notice beneficial effects up to 8 hours. Sexual stimulation is still needed for the medicine to work. - Will it affect my ability to drive?
Rarely, but some patients experience blurred vision or dizziness. If affected, do not drive or operate machinery. - Is it safe with my heart medications?
Sildenafil can dangerously interact with nitrates and some blood pressure medicines. Always inform your doctor or pharmacist about all current treatments for safe prescribing.
For further information, consult your GP, registered Australian pharmacy, or the TGA website. Never commence or change medication without professional advice.
