Enhance 9: Comprehensive Patient Information for Australia
Basic Product Information
| International Nonproprietary Name (INN) | Sildenafil Citrate |
|---|---|
| Australia Brand Names | Enhance 9, Viagra, Sildenafil Sandoz, Vizarsin, Silvasta |
| ATC Code | G04BE03 |
| Available Forms & Strengths | Tablets: 25 mg, 50 mg, 100 mg |
| Manufacturers | Enhance Pharmaceuticals, Pfizer Australia, several generic manufacturers |
| Prescription Status | Prescription Only Medicine (Schedule 4) |
Mechanism of Action
For patients: Enhance 9 contains sildenafil citrate, which helps increase blood flow to certain areas of the body. It works by relaxing blood vessel walls, allowing blood to flow more easily, which is essential for men with erection difficulties (“erectile dysfunction”).
For healthcare professionals: Sildenafil is a potent and selective inhibitor of cGMP-specific phosphodiesterase type 5 (PDE5) in the corpus cavernosum of the penis. By inhibiting PDE5, it increases levels of cyclic guanosine monophosphate (cGMP), resulting in smooth muscle relaxation and vasodilation.
Pharmacokinetics
- Absorption: Rapidly absorbed. Peak plasma concentrations occur 30–120 minutes after oral dose (median 60 min).
- Metabolism: Metabolised primarily by hepatic enzymes CYP3A4 (main pathway) and CYP2C9.
- Elimination: Excreted mainly as inactive metabolites; mainly via faeces (80%), some via urine (13%).
- Duration of Action: 4–6 hours (erectile response may vary between individuals).
Use in Everyday Life and Best Practices
Enhance 9 is often used by adult men who experience erectile dysfunction (difficulty in achieving or maintaining an erection sufficient for sexual activity). It should be taken approximately 1 hour before planned sexual activity, but anywhere between 30 minutes and 4 hours prior is effective.
- The recommended starting dose is 50 mg, taken as needed, once a day.
- Your doctor may adjust the dose between 25 mg and 100 mg, depending on effect and side effects.
- Swallow the tablet whole with water.
- You must be sexually stimulated for the medicine to be effective. It does not cause an erection without sexual stimulation.
- Do not take more than one dose in 24 hours.
- Store below 25°C, away from moisture or heat, and out of children’s reach.
Morning vs Evening Dosing
- Morning dosing: Not commonly used as spontaneous sexual activity is more frequent in the evening; may suit those with earlier routines or best response after sleep.
- Evening dosing: Preferred due to lifestyle and privacy factors; allows flexibility for planned activity.
- Take dose at similar times for consistency and predictability.
- Caution: Avoid dosing just after heavy or high-fat meals (see below for meal advice).
Taking with Food or on an Empty Stomach
- Sildenafil can be taken with or without food. However, taking it after a high-fat meal (typical in some Australian diets such as meat pies, fish and chips, or large BBQ meals) may delay the time to effect.
- For faster results, take the tablet on an empty stomach or after a light, low-fat meal.
Interaction Warnings
| Type | Interaction | Advice |
|---|---|---|
| Nitrate medications (e.g. GTN spray, anginine tablets) | Risk of severe low blood pressure | Do not take sildenafil with any nitrate medication |
| Other erectile dysfunction treatments | Possible additive effects, unwanted side effects | Do not combine with other PDE5 inhibitors or similar medicines |
| Alpha-blockers (e.g. prazosin) | Risk of symptomatic hypotension, dizziness | Space doses at least 4 hours apart; monitor for dizziness |
| Strong CYP3A4 inhibitors (e.g. ketoconazole, HIV protease inhibitors) | Increase in sildenafil levels | Use lower dose or alternative therapy |
| Alcohol | May worsen dizziness and reduce ability to get an erection | Limit alcohol intake before and after using Enhance 9 |
| Grapefruit juice | Can increase blood sildenafil levels | Avoid grapefruit and grapefruit juice |
| Other medicines (antihypertensives, antidepressants, antifungals, macrolide antibiotics) | Possible increased or decreased effectiveness or increased side effects | Ask your doctor or pharmacist before taking other medicines |
Indications for Use
| Indication | Status |
|---|---|
| Erectile dysfunction in adult men | Registered (approved) |
| Pulmonary arterial hypertension (under other brand names/forms) | Registered (approved) |
| Raynaud’s phenomenon | Off-label (specialist use) |
| Female sexual arousal disorder | Experimental/off-label |
Dosing According to Clinical Indication
| Population/Condition | Typical Dose | Max Dose/Day |
|---|---|---|
| Adult men with erectile dysfunction | 50 mg as needed, 30–60 min before activity | 100 mg |
| Elderly men (>65 years) | Start at 25 mg; titrate to response | 100 mg |
| Pulmonary arterial hypertension (adults, as Revatio®) | 20 mg three times daily | 60 mg total |
| Children (pulmonary hypertension: specialist use only) | 0.5–2 mg/kg three times daily | 60 mg |
Safety Profile & Side Effects
| Side Effect | Frequency | Advice |
|---|---|---|
| Headache | Very common | If persistent, consult doctor |
| Flushing (hot, red skin) | Common | Usually short-lived |
| Indigestion, upset stomach | Common | Take with a light meal, drink water |
| Blocked/stuffy nose | Common | Usually improves with time |
| Dizziness, vision changes (blue tint, blurred vision) | Less common | Do not drive if affected; inform doctor |
| Back or muscle pain | Less common | Usually mild and temporary |
| Allergic reactions (rash, swelling, breathing difficulty) | Rare | Seek urgent medical help |
| Priapism (erection >4 hours) | Very rare | Emergency: go to hospital |
Warnings: Not suitable for people with severe heart conditions, recent stroke or heart attack, untreated low blood pressure, or who are taking nitrate medicines.
Guidelines for Proper Use (Australian Context)
- Only use under supervision of a registered Australian doctor.
- Regular review with your GP or sexual health clinic is recommended.
- Do not share the medicine with anyone, even if symptoms are the same.
- Report any side effects or new symptoms to your pharmacist or doctor.
- If you miss a dose (for pulmonary hypertension), take as soon as remembered unless nearly time for next dose; do not double up.
- Don’t drive or operate machinery if you feel dizzy or have visual changes.
- Keep original packaging for proof of prescription if traveling within Australia.
- Pharmacy dispensing is only with valid Australian prescription; online sources should be Australian-registered pharmacies (check with the Pharmacy Board of Australia).
Alternative Treatment Options
- Tadalafil (Cialis®): Longer-acting (up to 36 hours), daily or as-needed dosing; may be reimbursed for certain conditions.
- Vardenafil (Levitra®): Similar effect to sildenafil, slightly different profile; some men prefer one over the other.
- Avanafil (Spedra®): Faster onset, may be an option if sildenafil is poorly tolerated.
- Vacuum erection devices, penile implants: Non-drug, mechanical options; suitable in certain cases.
- Psychological support/counselling: Especially for men with psychological rather than physical erectile dysfunction.
Consult your healthcare professional to choose the most appropriate option for your circumstances. Some alternatives may be included in the Australian schedule of pharmaceutical benefits (PBS), subject to eligibility.
Legal, Registration, and Reimbursement Status in Australia
- Enhance 9 (sildenafil) is a Schedule 4 (S4) Prescription Only Medicine as regulated by the Therapeutic Goods Administration (TGA), Australia.
- Registered for erectile dysfunction and pulmonary arterial hypertension in adults; use for other conditions may be off-label and needs specialist input.
- Reimbursement via the Pharmaceutical Benefits Scheme (PBS) is available for certain forms (e.g. pulmonary hypertension) under specific criteria.
- Not all private scripts are subsidised; check with your pharmacist or the PBS website for current listings.
- Australian doctors and pharmacies are required by law to comply with state and federal regulations regarding supply and dispensing of Enhance 9.
Latest Research and Clinical Guidance (2022–2025)
- Recent review articles and meta-analyses continue to confirm the safety and efficacy of sildenafil for erectile dysfunction, including in men with mild cardiovascular disease, as long as contraindications are respected (see: Australian Family Physician, 2023).
- Guidelines published by the Australian Therapeutic Guidelines: Sexual and Reproductive Health (2024) recommend PDE5 inhibitors as first-line treatment.
- Studies show that intermittent (on-demand) dosing reduces long-term side effect risk (BMJ, 2022), and newer research confirms that food delays but does not reduce the overall effectiveness.
- Emerging data for off-label uses such as Raynaud’s phenomenon, but routine use not endorsed by the TGA (Lancet, 2023).
- Ongoing trials in female sexual arousal disorder, but evidence remains insufficient for routine prescription.
Availability, Pack Sizes, and Delivery
| Pack Size | Typical Price Range (AUD) | Availability |
|---|---|---|
| 4 tablets (50 mg) | $19–$35 | Most local and online pharmacies (with prescription), same-day/next-day in major cities |
| 12 tablets (50 mg) | $50–$90 | Special order or online via PBS/private scripts |
| 28 tablets (25 mg / 50 mg / 100 mg) | $105–$160 | Larger pack, on prescription for long-term use |
| City | Standard Delivery | Express Delivery |
|---|---|---|
| Sydney | 1–2 business days | Same-day available |
| Melbourne | 1–2 business days | Same-day available |
| Brisbane | 1–3 business days | Next-day |
| Perth | 2–5 business days | 2–3 days |
| Regional/Remote | 3–7 business days | Contact pharmacy |
Note: Prices and delivery times may vary by pharmacy and prescription type.
Frequently Asked Questions (FAQ)
- Can I drink alcohol while taking Enhance 9?
Moderate alcohol (1–2 drinks, such as beer or wine) is unlikely to interact, but excessive alcohol may decrease effectiveness and increase side effects like dizziness and headache. It is usually best to limit alcohol intake when using this medication. - What should I do if I don’t get an erection after taking Enhance 9?
Ensure sexual stimulation occurs. If it regularly fails to work, review timing, food intake (avoid high-fat meals), and discuss with your GP—dose adjustment or alternative treatment may be helpful. - Is Enhance 9 safe with my heart medications?
Never use with nitrates or “heart spray” (GTN). For most other medications, sildenafil can be used with caution but always inform your doctor and pharmacist about all your medicines. - Can women use Enhance 9?
Enhance 9 (sildenafil) is not approved for use in women for sexual dysfunction in Australia outside of clinical research or under specialist supervision. - How do I get Enhance 9 in Australia?
You must have an Australian prescription from your GP or registered specialist. It can be dispensed at community or online pharmacies registered with the Pharmacy Board of Australia.
For further advice, consult your local pharmacist or healthcare professional. This information is intended to support—not replace—the relationship you have with your doctor or health team.
