Cialis (Tadalafil) – Comprehensive Patient Information Australia
Basic Product Information
| International Non-Proprietary Name (INN) | Tadalafil |
|---|---|
| Australian Brand Names | Cialis, Adcirca, Tadalis, generic Tadalafil |
| Anatomical Therapeutic Chemical (ATC) Code | G04BE08 |
| Available Forms & Strengths | Film-coated tablets: 2.5 mg, 5 mg, 10 mg, 20 mg |
| Manufacturer | Eli Lilly Australia Pty Ltd (main brand), various for generics |
| Legal Status | Prescription only (Schedule 4, S4) |
Mechanism of Action
For Patients: Tadalafil (brand name Cialis) works by relaxing blood vessels and increasing blood flow to certain areas of the body. Most often, it is prescribed to help men with erectile dysfunction (ED) achieve and maintain an erection when sexually aroused. Tadalafil is also used to help manage symptoms of benign prostatic hyperplasia (BPH - an enlarged prostate), and pulmonary arterial hypertension (Adcirca brand).
For Specialists: Tadalafil is a selective phosphodiesterase type 5 (PDE5) inhibitor. It prevents the breakdown of cyclic guanosine monophosphate (cGMP) in the corpus cavernosum of the penis, facilitating smooth muscle relaxation and increased penile blood flow. In BPH, tadalafil's effects on smooth muscle tissues relieve urinary symptoms. The prolonged half-life distinguishes tadalafil from other PDE5 inhibitors, permitting flexible dosing strategies.
Pharmacokinetics
- Absorption: Rapid, with peak plasma concentrations within 2 hours of oral intake.
- Metabolism: Predominantly hepatic via CYP3A4 enzyme.
- Elimination: Mainly via faeces (approximately 61%); some via urine (approx. 36%).
- Duration of Action: Long half-life (approximately 17.5 hours), allowing erectile responsiveness up to 36 hours post-dose ("the weekend pill").
Everyday Use and Best Practices (Australia Context)
Tadalafil may be used in two main ways:
- As needed ("on-demand"): Usually 10 or 20 mg before sexual activity, at least 30–60 minutes prior. Not to be taken more than once per day.
- Daily dosing: 2.5 or 5 mg taken at the same time every day, for men who are sexually active more than twice a week or require more spontaneous flexibility.
Speak to your Australian GP, urologist, or pharmacist to determine which regimen best fits your lifestyle and health profile.
- Tablets should be swallowed whole with water.
- Do not crush, chew or split tablets.
- Safe and effective only under medical supervision and prescription.
Dosing: Morning vs Evening
- As Needed: Take at least 30–60 minutes before anticipated activity, regardless of time of day.
- Daily Dosing: May be taken in the morning or evening, but it is important to take it at the same time each day for steady levels.
- Pros of Morning Dosing: May fit better with daily routines, reduces risk of missed doses.
- Pros of Evening Dosing: Convenient if intimacy occurs primarily at night; may reduce awareness of minor side effects during wakefulness.
Consistency helps maximise benefit and reduce risk of missed doses.
Taking With or Without Food (Australian Diet Context)
- Tadalafil can be taken with or without food. High-fat English or Australian-style meals (e.g., fried fish, steak & chips) do not significantly delay absorption.
- There's no need to alter your typical breakfast, lunch, or dinner to take tadalafil.
- Avoid excessive alcohol (see below). A moderate glass of wine or beer is usually fine, but heavy drinking increases risks.
Interaction Warnings
| Interaction | Category | Action/Advice |
|---|---|---|
| Nitrates (e.g., glyceryl trinitrate, isosorbide mononitrate) | Medicines | Severe risk of dangerous blood pressure drop; do not use together. |
| Alpha-blockers (e.g., prazosin, tamsulosin) | Medicines | May cause dizziness or fainting; use only under close supervision. |
| Alcohol (more than 5 standard drinks) | Food/Drink | Heightens risk of side effects (low blood pressure, fainting, headache). |
| Grapefruit/juice | Food | May increase tadalafil levels; avoid large amounts. |
| Medicines inhibiting CYP3A4 (e.g., erythromycin, ketoconazole, ritonavir) | Medicines | Require dose adjustment or avoidance; consult your prescriber. |
| Popper-type inhalants (amyl nitrite) | Recreational substances | Hazardous combination; do not use together. |
Indications
| Clinical Indication | Australian TGA Approved | Notes |
|---|---|---|
| Erectile dysfunction (ED) | Yes | Men over 18 years, both "as needed" and daily dosing |
| Benign prostatic hyperplasia (BPH) | Yes | Relieves urinary symptoms linked to prostate enlargement |
| Pulmonary arterial hypertension (as Adcirca) | Yes | Specialist supervision required |
| Female sexual dysfunction | No* | *Not TGA approved for this indication; research ongoing |
Dosing According to Clinical Indication
| Condition/Group | Recommended Dose | Comments |
|---|---|---|
| Erectile dysfunction (adults) | 10 mg (as needed), up to 20 mg max; or 2.5–5 mg daily | Take 30–60 min before activity. Adjust only as advised. |
| Benign prostatic hyperplasia (adults) | 5 mg once daily | For urinary symptoms; improvement seen after 2–4 weeks. |
| Pulmonary arterial hypertension (adults, Adcirca) | 40 mg (two 20 mg tablets) once daily | Taken at same time, specialist-only use |
| Elderly (over 65) | No routine dosage adjustment | Start at lowest effective dose. Assess kidney/liver function. |
| Pediatrics | Not indicated for ED/BPH under 18 years | Specialised use only in PAH under expert guidance |
Safety Profile & Side Effects
Most side effects are short-lived and mild. Always alert your GP or pharmacist if you have unexpected or severe symptoms.
| Common (≥1 in 100) | Rare/Serious | Warning Signs |
|---|---|---|
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|
|
If you experience serious side effects, call Triple Zero (000) or seek urgent care.
Guidelines for Proper Use (Australia)
- Consult your GP for regular review, especially if you have heart, liver, or kidney conditions.
- Never share your medicine with others.
- Keep out of reach of children.
- Do not exceed maximum recommended dose.
- If you miss a daily dose, take it as soon as you remember; skip if it's almost time for next.
- Store in a cool, dry place (below 25°C), away from direct sunlight.
Alternative Treatment Options
Other ED and BPH medications available in Australia may be covered by government schemes (PBS). Not all are subsidised; discuss access and costs with your prescriber.
- Sildenafil (Viagra, generic): Similar effectiveness, shorter duration (4–6 hours), less expensive PBS-listed options for some groups.
- Vardenafil (Levitra): Short-acting, alternative for those intolerant to others.
- Avanafil (Spedra): Very rapid onset, shorter duration, not PBS-listed; out-of-pocket costs may apply.
- Alprostadil injections or urethral suppositories: For men unresponsive to oral drugs; invasive, but effective in selected cases.
- BPH alternatives: Tamsulosin, dutasteride, finasteride (affect prostate size or muscle tone—well-established PBS-listed therapies).
Legal, Registration & Reimbursement in Australia
- Cialis and generic tadalafil are registered by the Therapeutic Goods Administration (TGA) for use in Australia.
- Classified as Prescription Only (Schedule 4, S4).
- Some brands, strengths, and indications may be listed on the Pharmaceutical Benefits Scheme (PBS), particularly for BPH and PAH (check PBS for current funding).
- ED indications typically require private prescription; not PBS-subsidised except certain circumstances (e.g., specified neurological impairment).
Latest Research & Clinical Guidance (2022–2025)
- The 2022 Australian Doctor Guidelines and the Urological Society of Australia and New Zealand (USANZ) advocate tadalafil as first-line for ED and moderate BPH symptoms owing to efficacy, tolerability, and ease of dosing.
- Australian consensus (2023) recommends daily low-dose as optimal for men preferring spontaneity or frequent sexual activity, supporting real-world patient satisfaction (Lee et al., 2023).
- Trials continue in female sexual dysfunction; currently off-label only (Loubeyre et al., 2024).
- New evidence (2024) suggests combination with lifestyle modification (exercise, reducing alcohol, weight management) further improves ED outcomes (Australian Dept Health).
Availability, Pack Sizes & Delivery in Australia
| Pack Size | Typical Brand | Indicative Price (AUD) | Estimated Delivery (Sydney, Melbourne, Brisbane, Perth) |
|---|---|---|---|
| 4 tablets (20 mg) | Cialis | $65–$90 | 1–2 days (major cities), 2–4 days (regional) |
| 28 tablets (5 mg) | Cialis, generics | $80–$130 | 1–2 days (major cities), 2–4 days (regional) |
| 30 tablets (2.5/5 mg) | Generic brands | $65–$110 | Same day pick-up available at select pharmacies |
Most chain pharmacies and pharmacy websites offer convenient ordering, with confidential packaging. Valid prescription required.
Frequently Asked Questions (FAQ)
- Can I use Cialis or generic tadalafil with heart, kidney or liver problems?
Use only under close medical supervision; dose adjustment may be needed. Do not use if taking nitrates or following a recent heart attack/stroke unless cleared by your specialist. - Is it safe to drink alcohol while taking Cialis?
Moderate, occasional alcohol is generally acceptable, but avoid heavy drinking (more than 5 standard drinks) while using tadalafil as this raises risk of low blood pressure and side effects. - Can women use Cialis?
Cialis/tadalafil is not approved for use in women in Australia; current studies are ongoing but use remains off-label and should be under strict specialist advice only. - How long before sexual activity should I take the medicine?
For the "as needed" approach, take one tablet at least 30–60 minutes before you plan to be sexually active. For daily dosing, steady readiness is achieved after a few days of regular use. - Is Cialis available over the counter in Australia?
No. All tadalafil products are Schedule 4 (Prescription Only). Only a registered Australian prescriber can provide a valid script.
