ED Advanced Pack – Comprehensive Medicine Information for Australia
Basic Product Information
| International Non-Proprietary Names (INN) | Sildenafil citrate, Tadalafil |
|---|---|
| Australia Brand Names | Viagra®, Cialis®, plus selected generics |
| ATC Code | G04BE03 (Sildenafil), G04BE08 (Tadalafil) |
| Available Forms & Strengths | Film-coated tablets (Sildenafil 50 mg, 100 mg; Tadalafil 10 mg, 20 mg) |
| Manufacturers | Pfizer Australia (Viagra), Eli Lilly Australia (Cialis), multiple generic manufacturers |
| Prescription Status | Prescription only (Schedule 4, S4) |
Mechanism of Action
Both Sildenafil and Tadalafil are classified as phosphodiesterase type 5 (PDE5) inhibitors. In simple terms, they work by increasing blood flow to the penis, assisting men with erectile dysfunction in achieving and maintaining an erection sufficient for sexual activity. They do this by relaxing smooth muscle in the blood vessels supplying the penis, which allows more blood to flow in when a man is sexually aroused.
For healthcare professionals: PDE5 inhibitors competitively bind to and inhibit the action of phosphodiesterase type 5, leading to increased levels of cyclic guanosine monophosphate (cGMP) within the corpus cavernosum. Nitric oxide (NO) released during sexual stimulation activates guanylate cyclase and increases cGMP, producing smooth muscle relaxation and enhanced cavernosal blood flow.
Pharmacokinetics
- Absorption: Sildenafil is rapidly absorbed with a Tmax of 30–120 minutes; Tadalafil has a Tmax of 2 hours. Bioavailability is not affected by age, but high-fat meals can delay absorption of sildenafil.
- Metabolism: Both are primarily metabolised in the liver by CYP3A4 (and to a lesser degree, CYP2C9), producing inactive metabolites.
- Elimination: Sildenafil half-life ~4 hours; Tadalafil half-life ~17.5 hours. Mainly excreted as metabolites in faeces and urine.
- Duration of Action: Sildenafil lasts up to 4–6 hours. Tadalafil is known as the “weekend pill,” effective up to 36 hours.
Use in Everyday Life & Best Practices
In Australia, PDE5 inhibitors are typically prescribed "as needed" 30–60 minutes before anticipated sexual activity. Some regimens allow tadalafil ("the daily pill") to be taken once daily regardless of sexual activity, offering greater spontaneity.
- Tadalafil 10 mg or 20 mg: Take at least 30 minutes before activity; effect can last up to 36 hours.
- Sildenafil 50 mg or 100 mg: Take about 1 hour before sexual activity; effect lasts 4–6 hours. May be taken on an as-needed basis, not exceeding once per day.
- Tip: Sexual stimulation is still required for either medicine to work.
- Consult your doctor before use to confirm treatment is suitable and safe for you.
Dosing in the Morning vs Evening
Morning dosing: May suit those with predictable routines or prefer sexual activity earlier in the day. With tadalafil’s longer duration, this may allow flexibility for spontaneous activity.
Evening dosing: Often preferred, especially for sildenafil, since sexual activity commonly occurs in the evening. Taking sildenafil with a heavy dinner can delay onset, so aim for at least 2 hours after a meal.
Tips: Strive for regularity if using daily tadalafil; take at approximately the same time each day. Changing dose timing is unnecessary for on-demand use, but plan for activity within the medicine’s window of effect.
Taking with Food or on an Empty Stomach
Sildenafil's absorption is slowed by high-fat meals – it works best on an empty stomach or after a light meal. Tadalafil is less affected by food, so can be taken regardless of meals or typical English dietary patterns.
- Traditional Australian diets: Fish and chips, “meat and three veg,” and other heavy meals may delay sildenafil. Consider timing your dose with lighter food or between meals for maximum effect.
- Alcohol consumption should be moderate with either medicine, as excess may reduce efficacy and increase side effects.
Interaction Warnings
Several food, medicine, and substance interactions are important to note:
| Interaction | Advice |
|---|---|
| Nitrates (GTN spray, nitroglycerin patches) | DANGER: Strictly contraindicated – may cause dangerous blood pressure drop. |
| Alpha-blockers (for hypertension or prostate) | Caution, risk of low blood pressure – consult a doctor. |
| Alcohol | Excess increases side effects and can worsen erection difficulties. |
| Grapefruit juice | May increase side effects by altering liver metabolism. |
| Other PDE5 Inhibitors | Avoid concurrent use. |
Indications
| Indication | Status |
|---|---|
| Erectile dysfunction (ED) in adult men | Approved |
| Pulmonary arterial hypertension* | Off-label/Alternative indicated product |
| Raynaud’s phenomenon* | Off-label |
| Benign prostatic hyperplasia (BPH) – tadalafil only | Approved |
*Specialist-only and may require authority prescription.
Dosing According to Indication
| Population | Sildenafil (ED) | Tadalafil (ED) |
|---|---|---|
| Adult men (18–65 years) | 50 mg as needed, increase to 100 mg if needed; max 1 per 24 hrs | 10–20 mg as needed, or 5 mg daily if appropriate |
| Elderly (>65 years) | Start at 25 mg, titrate cautiously | Start at 5–10 mg, max 20 mg |
| Pediatric | Not indicated | Not indicated |
| Severe renal/hepatic impairment | Avoid or use lowest starting dose under medical supervision | Avoid or use lowest starting dose under medical supervision |
Safety Profile & Side Effects
- Common side effects:
- Headache
- Facial flushing
- Indigestion (dyspepsia)
- Nasal congestion
- Back pain (tadalafil)
- Visual changes (sildenafil; blue tinge, blurred vision)
- Rare or serious effects:
- Priapism (erection lasting >4 hours; seek urgent help)
- Sudden hearing loss
- Cardiac symptoms (chest pain, arrhythmia)
- Allergic reactions (skin rash, swelling)
- Warnings:
- Do not use with nitrates or if you have untreated severe heart disease.
- Check with your cardiologist before use if you have cardiac risk factors.
- Monitor for visual changes; discontinue if sudden vision loss occurs.
Guidelines for Proper Use (Australia recommendations)
- Always get a prescription from a registered healthcare provider in Australia.
- Buy only from Australian-registered pharmacies to ensure genuine quality.
- Take the medicine whole, with a glass of water.
- If using daily dosing, keep a set routine for maximum benefit.
- Do not exceed prescribed dose or frequency.
- Inform your doctor or pharmacist of all current medicines and conditions.
- If you miss a daily dose, take it as soon as possible but do not double up.
- Store in original packaging, below 30°C, away from moisture and sunlight.
Alternative Treatment Options
| Name | Form | Pros | Cons | Reimbursed by PBS? |
|---|---|---|---|---|
| Vardenafil (Levitra®) | Tablet | Similar to sildenafil; some people experience fewer side effects | Shorter duration than tadalafil | No (private prescription) |
| Avanafil (Spedra®) | Tablet | Quicker onset, suitable for rapid use | May be costlier; limited long-term data | No |
| Alprostadil | Injection or urethral suppository | Useful if oral PDE5i not effective or contraindicated | More invasive; possible pain/discomfort | Yes (with specialist authority) |
| Vacuum pumps, counselling, testosterone therapy (if indicated) | Non-drug | Safe for men with cardiac risk; essential if psychogenic ED | Can be less convenient or less effective | No (private) |
Legal, Registration, and Reimbursement Status in Australia
- Registered medicines with the Therapeutic Goods Administration (TGA).
- Prescription (Schedule 4, S4) required. Self-medication and "over the counter" sales are illegal and unsafe.
- Reimbursement via the Pharmaceutical Benefits Scheme (PBS) is only available for certain special circumstances (such as spinal cord injury-related ED). Most men will pay private prescription prices.
- Dispensed by pharmacies registered under AHPRA; pharmacist consultation required for medicine supply.
- Importation for personal use (online) is subject to strict customs regulation and typically not recommended.
Latest Research and Clinical Guidance (2022–2025)
- Recent publications (2022–2024) reaffirm that PDE5 inhibitors remain first-line for most types of ED according to the Urological Society of Australia and New Zealand and international guidelines (European Urology, BJU International). (See: Hackett et al., BJU Int 2023; Flannigan et al., J Sex Med 2022).
- Tadalafil daily dosing increasingly preferred for men seeking spontaneous sexual activity, with no major safety concerns identified in real-world studies.
- Non-oral therapy, such as alprostadil, remains reserved for those who fail or cannot tolerate oral agents.
- Alternative therapies including psychosexual counselling, lifestyle modifications (diet, exercise, reducing alcohol/tobacco), and partner involvement are recommended adjuncts.
- No meaningful difference in long-term safety or efficacy between originator and generic products, per TGA pharmacovigilance reports (2024).
Availability and Delivery in Australia
| Pack Size | Indicative Price (private script) | Typical Pharmacy Availability | Delivery Times (metro areas) |
|---|---|---|---|
| 4 tablets | $20 – $65 (generic vs brand) | Common | Same-day – 2 business days |
| 8 tablets | $35 – $120 | Common | Same-day – 2 business days |
| 16 tablets | $70 – $220 | Usually available | 1–3 business days |
| Monthly pack (28/30 tablets, tadalafil daily) | $90 – $200 (generic/brand) | Order may be required | 2–5 business days |
In remote or rural areas, delivery may take longer (up to 7 days); consult with your pharmacy for precise estimates. Absentee signature-for-delivery may be required for S4 medicines.
FAQ – Common Patient Questions
- Do I need a prescription for the ED Advanced Pack in Australia?
Yes. By law, all PDE5 inhibitors (including the ED Advanced Pack) are prescription-only. You must have a valid script from an Australian prescriber. - Can I take these medicines with my other heart or blood pressure medicines?
Some medicines (like nitrates or alpha-blockers) can dangerously interact. Always inform your doctor or pharmacist about all your medications before starting these treatments. - How quickly do these medicines work, and how long do they last?
Sildenafil usually takes effect within 30–60 minutes and lasts 4–6 hours. Tadalafil works in about 30–45 minutes, lasting up to 36 hours. Both require sexual stimulation to be effective. - Can I buy these online?
Only buy from registered Australian pharmacies with a prescription for safety, legality, and product quality. Beware of unregulated online sources, which are unsafe and illegal. - Are there lifestyle changes that help ED in Australia?
Yes—healthy eating, regular physical activity, moderating alcohol, quitting smoking, and managing stress can significantly improve symptoms and treatment success.
