Tadalis SX (Tadalafil) – Comprehensive Patient Information for Australia
1. Basic Product Information
| International Non-proprietary Name (INN) | Tadalafil |
|---|---|
| Australia Brand Name(s) | Tadalis SX, Cialis, Adcirca (for PAH) |
| ATC Code | G04BE08 |
| Available Forms & Strengths | Film-coated tablets: 2.5 mg, 5 mg, 10 mg, 20 mg |
| Manufacturer(s) | Ajanta Pharma, Eli Lilly Australia Pty Ltd, various generic manufacturers |
| Prescription Status | Schedule 4 (Prescription only medicine) |
2. Mechanism of Action
For Patients: Tadalis SX (Tadalafil) works by relaxing blood vessels in the penis, making it easier to achieve and maintain an erection with sexual stimulation. It does not cause erections without arousal.
For Health Professionals: Tadalafil is a selective, reversible inhibitor of phosphodiesterase type 5 (PDE5). By preventing the breakdown of cyclic guanosine monophosphate (cGMP) in the corpus cavernosum, it enhances nitric oxide–mediated vasodilation during sexual arousal. In pulmonary arterial hypertension, it reduces pulmonary vascular resistance.
3. Pharmacokinetics
- Absorption: Tadalafil is rapidly absorbed after oral administration; peak plasma concentrations are usually achieved within 2 hours.
- Metabolism: Metabolised mainly by hepatic CYP3A4 enzyme.
- Elimination: Primarily excreted as metabolites in faeces (approx. 61%) and urine (approx. 36%).
- Half-life: Approximately 17.5 hours, supports once-daily or on-demand dosing.
- Duration of Action: Up to 36 hours (“weekend pill” effect).
4. Use in Everyday Life & Best Practices (Australia)
Tadalis SX is prescribed in Australia for adult men with erectile dysfunction (ED), and in some forms, for pulmonary arterial hypertension (PAH) or symptoms of benign prostatic hyperplasia (BPH).
- Typical Dosage (ED): 10 mg taken as needed, at least 30–60 minutes before sexual activity. Dose may be increased to 20 mg or reduced to 5 mg depending on effectiveness and tolerability.
- Daily Use (ED/BPH): 2.5–5 mg once daily at approximately the same time, with no regard to sexual activity timing.
Always follow your prescribing doctor's advice. Do not take more than one dose in a 24-hr period. Store tablets in original packaging below 25°C, away from humidity and direct sunlight.
5. Dosing in the Morning vs Evening
- On-Demand: Timing is flexible. Take 30–60 minutes before planned sexual activity. Tadalafil’s long half-life allows for spontaneity within a 36-hour window.
- Daily Use: Take at approximately the same time each day, morning or evening as suits your routine. Choose a time you will reliably remember (e.g., with breakfast or after brushing teeth at night).
- Tips: Aim for consistency. Taking at the same time each day minimises missed doses and maintains even levels of the medicine.
6. Taking with Food or on an Empty Stomach
- Effect of Food: Can be taken with or without food. High-fat meals do not substantially alter absorption but may modestly delay onset.
- Australian Dietary Context: There is no need for a special diet. Can be taken before or after meals, including typical Australian fare (meat, eggs, seafood, vegetables, fruit, dairy, etc.). Avoid excessive fatty foods and alcohol when possible for best results.
7. Interaction Warnings
| Substance | Interaction/Advice |
|---|---|
| Grapefruit juice | May raise Tadalafil levels; avoid or limit intake. |
| Alcohol | Excessive intake increases risk of hypotension, dizziness; moderate use advised. |
| Nitrates (GTN, isosorbide dinitrate, etc.) | Dangerous drop in blood pressure—do not use with Tadalafil. |
| Alpha-blockers (for BPH or hypertension) | Possible dizziness/fainting; use under close supervision only. |
| CYP3A4 inhibitors (e.g. ketoconazole, ritonavir) | May increase Tadalafil levels; dose adjustment may be needed. |
| Other ED medications (e.g. sildenafil, vardenafil) | Avoid combination. |
8. Indications
| Indication | Status in Australia | Notes |
|---|---|---|
| Erectile Dysfunction (ED) | Approved | Major indication |
| Pulmonary Arterial Hypertension (PAH) | Approved (as Adcirca) | Specialist prescription |
| Benign Prostatic Hyperplasia (BPH) | Approved (in combination with LUTS) | 5 mg daily |
| Raynaud’s phenomenon, female sexual dysfunction | Off-label | Not generally recommended; consult your doctor |
9. Dosing by Clinical Indication and Patient Group
| Indication | Adults (18–64 yrs) | Elderly (≥65 yrs) | Adolescents (<18 yrs) |
|---|---|---|---|
| ED – On-demand | 10–20 mg as needed | 10–20 mg as needed (monitor closely) | Not indicated or recommended |
| ED – Daily use | 2.5–5 mg once daily | 2.5–5 mg once daily (increase caution) | Not indicated or recommended |
| PAH (Adcirca formulation) | 40 mg once daily | 40 mg once daily | Specialist use only |
| BPH & LUTS | 5 mg once daily | 5 mg once daily (individual assess.) | Not indicated |
Dose adjustment may be required for people with moderate/severe liver or kidney disease. Always consult with your healthcare provider.
10. Safety Profile & Side Effects
- Common (≥1/10): Headache, indigestion, back pain, muscle aches, flushing, nasal congestion.
- Uncommon (≥1/100, <1/10): Dizziness, blurred vision, palpitations, stomach upset, raised heart rate, rash.
- Rare (≥1/10,000, <1/1,000): Sudden hearing loss, priapism (painful/prolonged erection), severe allergic reactions, chest pain, fainting.
- Serious warnings: Seek urgent medical help if you experience an erection lasting more than 4 hours, chest pain, or sudden loss of vision/hearing.
11. Guidelines for Proper Use (for Australia)
- Take only as prescribed by your Australian doctor or sexual health clinic.
- Do not take after heavy drinking or recreational drug use.
- Do not combine with other PDE5 inhibitors.
- Store out of reach of children, in the original blister pack.
- Have a check-up every 6–12 months for ongoing safety review.
- For rural or remote patients, telehealth consults and eScripts are supported across Australia.
- Discard unused or expired tablets via local pharmacy returns (RUM Project).
12. Alternative Treatment Options
- Other PDE5 inhibitors: Sildenafil (Viagra; subsidised on the PBS for PAH only), Vardenafil (Levitra), Avanafil (Stendra). All work in a similar manner, but differ in onset, duration, and side effect profiles.
- Self-injection: Alprostadil (Caverject)—more invasive, used if oral agents fail.
- Vacuum erection devices: Non-drug option, effective but less discreet.
- Psychotherapy/Counselling: Useful if psychological factors contribute.
- Testosterone therapy: For men with proven deficiency (after specialist review).
Pros & Cons: Tadalafil has the longest duration and allows for more spontaneity than sildenafil/vardenafil, but interacts more with alcohol and some medicines. Sildenafil acts faster but “wears off” sooner. Vacuum devices can be effective, but less convenient.
13. Legal, Registration & Reimbursement Status in Australia
- Legal status: Prescription only (Schedule 4, controlled by the Prescription Medicines Code of Practice)
- Regulator: Registered with the Therapeutic Goods Administration (TGA), Australia
- Reimbursement: NOT subsidised for erectile dysfunction but may be partly reimbursed for PAH if prescribed by a specialist, via the Pharmaceutical Benefits Scheme (PBS)
- Not available through the Pharmaceutical Benefits Scheme (PBS) for ED (even if severe), as of June 2024
- Private prescriptions required for general use; eligible for telehealth and electronic scripts
14. Latest Clinical Research & Guidance (2022–2025)
- Recent guidelines (2023/24, British Association of Urological Surgeons, European Association of Urology): Tadalafil remains first-line for both on-demand and once-daily management of ED and LUTS/BPH.
- Meta-analyses (2022–2024): Once-daily Tadalafil is effective for men with moderate-to-severe ED, including those with diabetes and cardiovascular disease.
- Safety: Well tolerated for most; no evidence of significant fertility impairment. Rare cardiovascular side effects mainly in those with pre-existing risk factors, as per 2023 TGA Safety Update.
- Australian Clinical Guidance: Tadalafil is not approved for women or children; not recommended for use with PDE5 inhibitors or nitrates. Initiation should only occur after a full cardiovascular assessment.
- Source References: Australian Medicines Handbook 2024; TGA Consumer Medicines Information (CMI); EAU Guidelines (2023); EBSCOHost and Medline publications (2022–2024).
15. Availability & Delivery in Australia
| Pack Size | Approx. Price (AUD, private Rx) | Delivery (Sydney) | Delivery (Melbourne) | Delivery (Perth) | Delivery (Brisbane) |
|---|---|---|---|---|---|
| 4 x 20 mg tablets | $29–$45 | Same/Next working day | 1–2 working days | 2–3 working days | 1–2 working days |
| 8 x 20 mg tablets | $49–$85 | Same/Next working day | 1–2 working days | 2–3 working days | 1–2 working days |
| 30 x 5 mg tablets | $95–$130 | Same/Next working day | 1–2 working days | 2–3 working days | 1–2 working days |
- Availability: Stocked by most community and online Australian pharmacies with valid prescription.
- Express Post: Usually available for metro and major rural areas. Regional/remote deliveries via Australia Post or courier may take longer.
16. Frequently Asked Questions (FAQ)
- Will Tadalis SX work first time?
Many men find Tadalafil (Tadalis SX) effective on the first dose, but some require several doses and adjustment of timing for best effect. Sexual stimulation is required for it to work. - Will I have an erection all day?
No. Tadalafil increases the ability to get and maintain an erection only with sexual arousal. Its effects last up to 36 hours but do not cause constant erections. - Can I drink alcohol?
It is safe to have small amounts of alcohol (1–2 drinks) with Tadalafil, but avoid binge drinking as this can increase the chance of side effects like low blood pressure or dizziness. - Is it safe to buy Tadalis SX online in Australia?
Yes, provided you use a legally registered Australian pharmacy requiring a prescription. Always avoid unregistered online sources, as counterfeit products are common outside the regulated system. - What if it doesn’t work?
Speak to your doctor or pharmacist. Factors like food, stress, underlying health and other medications may affect efficacy. Your doctor may adjust the dose, change medications, or suggest lifestyle modifications.
Note: This information is for educational purposes and should not replace advice from your healthcare provider. Please consult your doctor or pharmacist for personal recommendations.
