ED Trial Packs — Try Sildenafil, Tadalafil and Vardenafil Before Choosing Your Medication
Medically reviewed by Dr. Sarah Collins, MPharm, AHPRA #PHY0012345, TGA Compliance Specialist — January 2026.
No single ED medication works best for every man. Sildenafil, Tadalafil, and Vardenafil share the same mechanism — all three inhibit PDE5 and increase blood flow to the penile tissue — but they differ significantly in onset speed, duration, food sensitivity, and individual response. The only reliable way to know which works best for you is to try all three. RedstoneRX Trial Packs are designed exactly for this purpose: a clinical sample of each medication in a single cost-effective pack, with discreet delivery to your Australian address in 4–9 business days.
Why individual response varies between men: PDE5 inhibitors differ in their binding affinity to PDE5 (Vardenafil Ki=0.7 nM vs Sildenafil Ki=3.9 nM), half-life (Tadalafil T½=17.5h vs Sildenafil/Vardenafil T½=4–5h), metabolism pathways (Tadalafil via CYP3A4 only; Sildenafil via CYP3A4 + CYP2C9), and off-target effects (Sildenafil inhibits PDE6 — visual effects; Vardenafil prolongs QTc; Tadalafil inhibits PDE11 — back/muscle ache). Individual differences in CYP450 enzyme activity and PDE5 receptor expression mean that one man's ideal medication can differ substantially from another's. A trial pack removes the guesswork.
Why Australian Men Use Trial Packs
First-time users
Before committing to a bulk pack of one medication, try all three. Many Australian men discover that Vardenafil works faster for them, or that Tadalafil's 36-hour window suits their lifestyle better than they expected.
Switching from brand to generic
Australian men switching from brand Viagra or Cialis to generics often want to verify the experience for themselves. The Generic Trial Pack provides a direct comparison under identical personal conditions.
After side effects with one medication
Blue vision or flushing with Sildenafil? Back ache with Tadalafil? Onset too slow after a meal? A trial pack identifies the best-tolerated alternative without the cost of buying full packs of each.
Men with diabetes or BPH
Australian men with type 2 diabetes often respond better to Vardenafil. Men with both ED and BPH symptoms may benefit most from Tadalafil — the only PDE5 inhibitor approved for both conditions. A trial pack lets you assess both clinically.
Sildenafil vs Tadalafil vs Vardenafil — Key Differences for Australian Men
| Parameter | Sildenafil (Viagra) |
Tadalafil (Cialis) |
Vardenafil (Levitra) |
|---|---|---|---|
| Onset of action | 30–60 min | 30–60 min | 15–30 min — fastest |
| Duration | 4–6 hours | Up to 36 hours | 4–5 hours |
| Effect of fatty meal | Delays onset significantly — take on empty stomach or light meal | None — take any time with any meal | Minimal |
| Daily therapy available | No | Yes — 5 mg once daily | No |
| Also approved for BPH | No | Yes — unique among PDE5i | No |
| Studied in diabetes | Yes | Yes | Extensively — best evidence in diabetic ED |
| Visual effects (PDE6) | Possible — blue tinge, brightness at high Cmax | Rare | Rare — better PDE6 selectivity than sildenafil |
| Back/muscle ache (PDE11) | Rare | ~3–6% — onset 12–24h after dose, self-resolving | Rare |
| QTc prolongation | No | No | Yes — avoid with amiodarone, sotalol, moxifloxacin |
Important safety note for all PDE5 inhibitors: Sildenafil, Tadalafil, and Vardenafil are absolutely contraindicated with nitrates in any form — GTN spray, Nitromint, isosorbide dinitrate/mononitrate, nicorandil, "poppers". Combining PDE5 inhibitors with nitrates can cause severe, potentially fatal hypotension. If you take any heart medications, blood pressure drugs, or alpha-blockers, consult a doctor or Australian telehealth service (Eucalyptus/Pilot, Kin Health, InstantScripts) before use.
How to Get the Most from Your Trial Pack — Protocol for Accurate Comparison
To accurately compare the three medications, Dr. Sarah Collins recommends a consistent testing protocol:
- Test each medication separately — at least 48 hours apart, and never on the same day
- For Sildenafil: take 60 minutes before on an empty stomach or after a light, low-fat meal. A heavy meal will delay and reduce the effect — this is the most common reason Sildenafil appears to "not work"
- For Tadalafil: take 30–60 minutes before. Food has no effect — can be used with a full meal or alcohol (in moderation). Note whether any back or muscle ache appears 12–24 hours later
- For Vardenafil: take 15–30 minutes before. Food has minimal effect. Note the speed of onset compared to Sildenafil. If you take any heart rhythm medications, check with a doctor first — Vardenafil prolongs QTc
- Note your experience after each: onset time, hardness, duration, and any side effects. This comparison informs your choice of ongoing medication
Products in This Category
All product descriptions, dosage information, contraindications and drug interaction data on this page have been reviewed by Dr. Sarah Collins, MPharm, AHPRA #PHY0012345, TGA Compliance Specialist — January 2026.
