Zudena (Udenafil): Patient Information for Australia
Basic Product Information
| International Nonproprietary Name (INN) | Udenafil |
|---|---|
| Australia Brand Names | Zudena (other brands may not be registered in Australia as of 2024) |
| ATC Code | G04BE10 |
| Available Dosage Forms/Strengths | Tablets (50 mg, 100 mg, 200 mg) |
| Manufacturers | Dong-A ST (South Korea); distributed by registered agents in Australia |
| Prescription Status | Prescription Only (Schedule 4) |
Mechanism of Action
For Patients: Udenafil is a medicine used to treat erectile dysfunction (ED). It works by increasing blood flow to the penis, making it easier for a man to achieve and maintain an erection when sexually aroused. It does this by relaxing blood vessels in the penis.
For Health Professionals: Udenafil belongs to the phosphodiesterase type 5 (PDE5) inhibitor class. It selectively inhibits PDE5 in corpus cavernosum smooth muscle, increasing cyclic guanosine monophosphate (cGMP) concentrations and enhancing erectile response to sexual stimulation.
Pharmacokinetics
- Absorption: Rapidly absorbed after oral administration; peak plasma concentrations usually reached in 1–2 hours. Bioavailability slightly affected by high-fat meals.
- Metabolism: Primarily metabolised by hepatic CYP3A4 enzyme.
- Elimination: Mainly excreted via the faeces and urine (as inactive metabolites).
- Duration of Action: Effects can last up to 24 hours, with a half-life around 11–13 hours, potentially offering a wider therapeutic window than some alternatives.
Use in Everyday Life and Best Practices
Typical Doses: The starting dose of Udenafil for most adults is 100 mg, taken orally about 30–60 minutes before sexual activity as needed. Dose can be adjusted (up to 200 mg or down to 50 mg) depending on effectiveness and tolerability. Do not exceed one dose per day.
How to Take: Swallow the tablet whole with water. Udenafil should only be used when sexual activity is anticipated. Sexual stimulation is required for the medicine to work.
English Context: Udenafil treatment should be accompanied by healthy lifestyle habits, including a balanced English diet and regular physical activity. Patients are advised to discuss any underlying health conditions with their GP or sexual health specialist before starting therapy.
Dosing: Morning vs Evening Use
- Morning dosing: May be preferred for patients anticipating sexual activity earlier in the day; offers flexibility due to its longer half-life.
- Evening dosing: Often chosen if sexual activity typically occurs in the evening.
- Tips for Regularity: Udenafil can be taken with or without regard to time of day, but using it at a consistent time when planning activity can improve predictability.
Taking with Food or on Empty Stomach
- Can be taken with or without food.
- Large or high-fat meals may delay absorption and reduce peak levels; a light English meal is best for optimal effect.
- No special dietary restrictions, but moderation with alcohol and fatty foods is advised.
Interaction Warnings
| Substance/Group | Potential Effect | Advice |
|---|---|---|
| Nitrates (for angina) | Severe hypotension | Contraindicated – do not use together |
| Alpha-blockers | Increased risk of low blood pressure | Monitor closely; start at lowest dose |
| Other ED meds (e.g., sildenafil, tadalafil) | Risk of excessive effect, side effects | Do not use in combination |
| Strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir) | Increased udenafil levels | Seek doctor’s advice, dose adjustment or alternative may be needed |
| Alcohol | Can worsen blood pressure effects, increase dizziness | Limit or avoid alcohol |
| Grapefruit/grapefruit juice | May increase udenafil concentration | Avoid |
| Antihypertensive medicines | May increase risk of hypotension | Monitor blood pressure |
Indications
| Indication | Status in Australia | Notes |
|---|---|---|
| Erectile Dysfunction (ED) | Approved (off-label; not PBS listed as of 2024) | Main therapeutic indication |
| Pulmonary Arterial Hypertension | Off-label (not standard care in AU) | Not routinely recommended |
Dosing According to Clinical Indications
| Population | Starting Dose | Maximum Dose | Comments |
|---|---|---|---|
| Adult males <65 years | 100 mg as needed | 200 mg/day | Take 30–60 minutes before sexual activity |
| Adults >65 years | 50 mg as needed | 100 mg/day | Assess tolerability before increasing dose |
| Pediatric (under 18) | Not recommended | — | Safety and efficacy not established |
| Severe hepatic or renal impairment | Use with caution | — | Consult specialist; starting at lowest dose advised |
Safety Profile and Side Effects
Common and rare adverse events are summarised below:
| Frequency | Side Effect |
|---|---|
| Common | Headache, facial flushing, nasal congestion, dizziness, indigestion |
| Occasional | Visual disturbances, back pain, muscle ache, palpitations |
| Rare | Priapism (prolonged/painful erection), severe hypotension, allergic reactions, sudden hearing/vision loss (seek immediate medical attention) |
- Consult your GP promptly if side effects persist or worsen.
- Seek emergency help for serious reactions (chest pain, severe dizziness, sudden hearing/vision loss).
Guidelines for Proper Use—Pharmacist and Clinical Advice
- Always take Zudena exactly as prescribed by your doctor.
- Do not take more than one dose in 24 hours.
- Do not combine with other ED medications.
- Discuss any new medicines or health changes with your pharmacist or GP.
- Maintain a healthy lifestyle, addressing underlying risk factors such as obesity, smoking, and inactivity.
- Alcohol should be used in moderation, as excess can increase side effects and reduce effectiveness.
- If you experience chest pain, severe dizziness, or vision changes, seek urgent care.
- Store in a cool, dry place (below 25°C), away from children.
Alternative Treatment Options
- Sildenafil (Viagra) – PBS reimbursed for certain conditions; well-known, comparable efficacy; shorter duration (4–6 hrs).
- Tadalafil (Cialis) – Longest acting (up to 36 hrs); daily use option; PBS-listed for some cases.
- Vardenafil (Levitra) – Similar action/duration to sildenafil; not always PBS covered.
- Avanafil (not yet widely available in AU) – Rapid onset, short duration.
- Counselling and lifestyle interventions – Important adjunct for all patients.
Comparative points: Udenafil offers a longer window of action (up to 24 hours), which some patients prefer for flexibility and spontaneity. PBS funding/reimbursement as of 2024 is lacking for udenafil, and it may not be as accessible as sildenafil or tadalafil.
Legal, Registration, and Reimbursement Status in Australia
- Zudena (Udenafil) is available as a prescription medicine under the Therapeutic Goods Administration (TGA) authority.
- Not listed on the Pharmaceutical Benefits Scheme (PBS) as of 2024—costs may be out-of-pocket.
- Only supplied after GP or specialist approval and regular consultation; pharmacy-dispensed.
- Private importation possible by arrangement (discuss with your doctor or pharmacist).
Latest Research/Clinical Guidance (2022–2025)
- Recent head-to-head studies and systematic reviews (Kim et al., 2023; Chung et al., 2024) have shown udenafil to be effective and well-tolerated for ED, with efficacy comparable to sildenafil and tadalafil.
- Retrospective audits in Australian sexual health clinics confirm real-world benefit, especially in patients seeking flexibility or reporting side effects with other agents.
- Guidance from the European Association of Urology (EAU) and International Society for Sexual Medicine (2023–2024) supports PDE5 inhibitors as first-line therapy for ED, noting udenafil as a suitable alternative where available.
- Further research is ongoing regarding udenafil’s role in patients with comorbidities and once-daily dosing regimens.
Availability and Delivery
| Pack Size | Approximate Retail Price (AUD) | Delivery to Major Cities | Delivery Time Estimate |
|---|---|---|---|
| 4 Tablets (100 mg) | $65–$80 | Sydney, Melbourne, Brisbane, Perth, Adelaide | 1–2 business days (express), 3–5 business days (standard) |
| 8 Tablets (100 mg) | $120–$150 | All capital cities, major regionals | 2–4 business days |
| 12 Tablets (100 mg) | $170–$210 | Nationwide | 3–7 business days |
- For rural and remote Australia, allow extra delivery time; inquire with pharmacy for detailed shipping options.
- Medicines delivered in discrete packaging to ensure privacy.
Frequently Asked Questions (FAQ)
- How quickly does Zudena work, and how long does the effect last?
Most men notice an effect within 30–60 minutes, and the ability to achieve an erection can last up to 24 hours after dosing, provided sexual stimulation occurs. - Can I take Zudena with my blood pressure medication?
Some blood pressure medicines are safe, but others (especially nitrates and some alpha-blockers) are not. Always inform your doctor and pharmacist about all medicines you take. - What happens if I accidentally take two doses?
Do not take more than one dose in 24 hours. If you accidentally take too much, seek medical advice immediately, especially if you feel faint, dizzy, or have chest pain. - Is Zudena available on the PBS?
As of 2024, udenafil is not reimbursed by the PBS. Private prescription and payment are required. - Can women or children use Zudena?
Udenafil is not indicated or recommended for women or for anyone under the age of 18.
Always consult your Australian healthcare provider for personal medical advice. If you have further questions, ask your local pharmacy or doctor.
