Fildena CT (Sildenafil Citrate): Comprehensive Patient Guide for Australia
Basic Product Information
| International Nonproprietary Name (INN) | Sildenafil Citrate |
|---|---|
| Australian Brand Names | Fildena CT, Viagra, Silvanol |
| ATC Code | G04BE03 |
| Available Forms & Strengths | Chewable tablets, 25 mg, 50 mg, 100 mg |
| Manufacturers | Fortune Healthcare, Troikaa Pharmaceuticals (global); various Australian pharma importers |
| Prescription Status (Australia) | Prescription Only Medicine (Schedule 4, Rx required) |
How Fildena CT (Sildenafil Citrate) Works
Fildena CT contains sildenafil citrate, a medicine widely used for the treatment of erectile dysfunction (ED) in adult males. Sildenafil works by inhibiting an enzyme known as phosphodiesterase type 5 (PDE5). By blocking this enzyme, sildenafil helps relax blood vessels in the penis and improves blood flow in response to sexual stimulation.
- For patients: This improved blood flow helps men with ED achieve and maintain a firmer erection suitable for sexual activity, but only when sexually aroused.
- For healthcare providers: Sildenafil is a selective PDE5 inhibitor which enhances nitric oxide–mediated vasodilation in the corpus cavernosum by increasing cyclic guanosine monophosphate (cGMP) levels.
Pharmacokinetics (How Your Body Processes Fildena CT)
- Absorption: Sildenafil is rapidly absorbed; peak plasma concentrations usually occur within 30–120 minutes after oral administration, typically ~1 hour.
- Metabolism: Extensively metabolised in the liver (primarily via CYP3A4, with a minor role for CYP2C9).
- Elimination: Primarily excreted as metabolites in the faeces (approx. 80%) and in urine (approx. 13%).
- Duration of action: Effects can last up to 4–6 hours after ingestion, with diminishing effectiveness after 2–4 hours.
Practical Use in Everyday Life
- Typical Dose: For most patients, the recommended starting dose is 50 mg taken as needed, about one hour before sexual activity. Dosage may be increased to 100 mg or decreased to 25 mg based on effectiveness and tolerability.
- How to Use: Chewable tablets may be chewed or swallowed whole, with or without water. Take only one dose per day unless advised otherwise by your healthcare provider.
- England-Specific Advice: In accordance with Australian clinical standards and guidelines published by the Therapeutic Goods Administration (TGA) and the Royal Australian College of General Practitioners (RACGP), always use sildenafil under medical supervision and strictly as prescribed.
- Best practices: Individualise use; not intended for continuous daily use. Do not split or crush tablets unless the form is designed for splitting (ask your pharmacist if unsure).
Dosing: Morning vs Evening Use
- Morning: Not typically used first thing in the morning unless the patient expects sexual activity during daylight hours. Onset may be faster if taken on an empty stomach.
- Evening: Most commonly taken in the early evening or around planned romantic encounters for convenience and privacy.
- Tips: Choose a consistent time based on your lifestyle and frequency of sexual activity; do not take more than one dose in a 24-hour period. Regularity is less important than timing the dose with sexual activity.
Taking Fildena CT with Food or on an Empty Stomach
- With food: Heavy or high-fat meals (such as typical English/Australian fare like steak, fish and chips, or full fry-ups) can delay the onset of action by up to an hour or reduce effectiveness. Light meals are less likely to interfere.
- On an empty stomach: Typically associated with faster onset and stronger effect. Ideal if you require reliable performance.
- Australia dietary advice: Avoid fatty or greasy meals before taking Fildena CT for best results, but always stay hydrated and practice moderation with alcohol.
Interaction Warnings
| Substance/Category | Effect/Warning |
|---|---|
| Alcohol | Excessive consumption may increase risk of side effects (low blood pressure, dizziness); moderate consumption is generally tolerated. |
| Nitroglycerin & nitrates | Contraindicated; may cause dangerous drop in blood pressure. |
| Amlodipine & other antihypertensives | Monitor for hypotension; risk may be increased. |
| Other ED treatments (avanafil, tadalafil, vardenafil) | Do not combine; risk of additive side effects and toxicity. |
| Grapefruit & grapefruit juice | May increase blood levels of sildenafil, increasing risk of adverse effects. |
| Antifungals, some antibiotics (e.g. erythromycin, ketoconazole) | Can raise sildenafil levels; dose adjustment may be needed. |
| Protease inhibitors (HIV treatment) | Strong interaction; lower starting dose recommended. |
Indications
| Indication | Use |
|---|---|
| Erectile Dysfunction (ED) in adult men | First-line, approved, on-prescription |
| Pulmonary arterial hypertension (PAH) | Sometimes prescribed off-label, but specific formulations/brands are preferred for this condition |
| Raynaud's phenomenon (off-label) | Rare, specialist use |
Dosing According to Clinical Indications
| Population | Erectile Dysfunction | Pulmonary Arterial Hypertension* |
|---|---|---|
| Adults | 50 mg as needed, adjust between 25–100 mg; max once/day | 20 mg three times daily (formulation/brand-specific) |
| Elderly (65+) | Start at 25 mg due to increased sensitivity | As above, with caution |
| Adolescents & Children | Not indicated | Specialist paediatric doses only (PAH) |
*Sildenafil for PAH is a specialist indication; do not use Fildena CT for PAH unless specifically advised by a physician.
Safety Profile & Side Effects
| Frequency | Side Effect | Advice |
|---|---|---|
| Common (1–10%) | Headache, flushing, indigestion, nasal congestion, dizziness, visual disturbance (blue tinge, blurred vision) | Usually mild and temporary. Consult your pharmacist if persistent. |
| Uncommon (0.1–1%) | Palpitations, rapid heartbeat, temporary memory loss, rash | Contact your doctor if severe. |
| Rare (<0.1%) | Prolonged erection (priapism), sudden hearing loss, severe allergic reaction | Seek urgent medical help. |
| Warnings | Do not use with nitrates; caution in severe heart, liver, or kidney problems | Always check with your GP |
Guidelines for Proper Use: Pharmacist/Clinic Tips
- Always obtain sildenafil (including Fildena CT) on a valid Australian prescription from your GP or a registered specialist.
- Store tablets in cool, dry conditions—avoid bathroom cabinets and direct sunlight.
- Do not share your medicine with others, even if they have similar symptoms.
- Report side effects or persistent symptoms to your healthcare professional promptly.
- Contact your doctor if you notice chest pain, sudden vision or hearing loss, or an erection lasting longer than 4 hours.
- Follow all instructions as provided by your doctor or pharmacist, particularly if you have coexisting medical conditions such as heart disease, hypotension, liver or kidney problems.
Alternative Treatment Options
- Tadalafil (Cialis®): Longer duration (up to 36 hours), can be taken daily (2.5 or 5 mg) or on-demand (10/20 mg); slower onset than sildenafil but preferred by men who desire spontaneity; PBS-reimbursed for some conditions.
- Vardenafil (Levitra®/Vivanza®): Similar onset and duration as sildenafil; sometimes preferred for men with diabetes.
- Avanafil (Spedra®): Faster onset, shorter duration; less available in Australia.
- Psychosexual therapy & counselling: Always recommended alongside medication when psychogenic ED is suspected.
- Vacuum erection devices: Device-based, drug-free option; available from registered medical suppliers.
Legal, Regulatory & Reimbursement Status in Australia
- Sildenafil citrate (Fildena CT) is listed as a Schedule 4 medication (Rx only) and supplied under the Therapeutic Goods Administration (TGA) regulations.
- Prescription required for purchase from pharmacies (including community, hospital, and online pharmacies registered in Australia).
- The Pharmaceutical Benefits Scheme (PBS) reimburses sildenafil citrate for erectile dysfunction in select indications, such as post-prostatectomy and pulmonary arterial hypertension (specific brands).
- For ED unrelated to PBS-listed medical events, patients typically pay the full private price.
- Not to be imported outside of TGA-approved channels; check with the TGA or your doctor regarding any direct-to-patient imports.
Latest Research & Clinical Guidance (2022–2025)
Recent guidelines from the Australasian Chapter of Sexual Health Medicine (AChSHM, RACP 2022–25) and Australian Clinical Practice Guidelines continue to recommend PDE5 inhibitors, including sildenafil, as first-line therapy for erectile dysfunction. Head-to-head studies maintain similar efficacy and safety profiles for different PDE5 inhibitors.
Updated evidence suggests that appropriate cardiovascular risk assessment is essential before starting ED treatment, and low-dose/PRN therapy has equivalent safety to daily dosing (Ref: RACGP Red Book 10th Ed, 2023; Lancet Diabetes Endocrinol. 2024: Clinical Update on Sexual Health).
For PAH, Australian and international pulmonology societies recommend specialist assessment and use of TGA-approved sildenafil brands at lower doses.
Availability & Delivery in Australia
| Pack Size | No. of Tablets | Indicative Private Price* | Delivery Time (days) |
|---|---|---|---|
| Small | 4 | $14–$22 | 1–2 (Sydney, Melbourne, Brisbane) |
| Medium | 8 | $26–$40 | 2–3 (Canberra, Adelaide, Perth, Hobart) |
| Large | 20 | $48–$90 | 3–5 (regional/rural Australia) |
*Prices are approximate (as of May 2024), not PBS-discounted. Actual prices and delivery times may vary; always consult your local pharmacy.
Frequently Asked Questions (FAQ)
Q1: Can I use Fildena CT if I have heart disease or take heart medicines?A1: Always check with your doctor first. Fildena CT (sildenafil) is not safe if you use nitrate medications for chest pain or some heart failure drugs. It may be used cautiously in many heart patients, but only under strict medical supervision.
Q2: Will Fildena CT work with alcohol or after a big meal?
A2: Moderate alcohol is unlikely to stop the medicine from working, but heavy drinking increases side effects and may lessen sexual performance. Heavy, fatty meals can delay its action—take it on an empty stomach for the quickest effect.
Q3: Is Fildena CT safe for older men (65+)?
A3: Yes, but start with a lower dose (e.g., 25 mg) and monitor for side effects more closely. Always discuss full medical history with your GP.
Q4: Is it legal to buy Fildena CT online in Australia?
A4: Only with a valid Australian prescription from a registered doctor, through TGA-registered pharmacies. Be cautious of overseas websites and counterfeit sources.
Q5: How quickly does Fildena CT work, and how long does it last?
A5: Onset is usually 30–60 minutes after taking the tablet (faster on an empty stomach). Effects last about 4–6 hours, but this varies by individual.
