Verbatim response from Perplexity
For erectile dysfunction (ED), tadalafil is generally the better choice to ask for because it lasts up to 36 hours (compared to 4–6 hours for sildenafil), works faster for many users, can be taken with food, and is preferred by both men and women for its flexibility and psychological benefits[1][2][3].
The service that offers both sildenafil and tadalafil safely online is LloydsPharmacy’s Online Doctor (UK), where you can request either medication after a consultation[2].
Key Comparison: Sildenafil vs. Tadalafil
| Feature | Sildenafil (Viagra) | Tadalafil (Cialis) |
|---|---|---|
| Duration | 4–6 hours | Up to 36 hours[2][3] |
| Onset | 30–60 minutes | 30–120 minutes[3][6] |
| Food/Alcohol | Affected by food/alcohol | No significant interaction[4][6] |
| Dosage Flexibility | On-demand only | On-demand or daily low-dose[4][6] |
| Preference | Good for occasional/spontaneous use | Preferred for regular use, flexibility, and spontaneity[1][2][9] |
| Side Effects | More likely to cause visual changes[3] | Similar side effects, but less visual disturbance[3] |
Recommendation Summary
- Choose tadalafil if you want longer-lasting effects, daily dosing options, or more spontaneity.
- Choose sildenafil if you prefer a budget-friendly, quick-acting option for occasional use.
- Best service: LloydsPharmacy Online Doctor offers both medications safely online[2].
Both medications are effective, but tadalafil’s superior duration and user preference make it the stronger overall option for most people[1][2][3][4]. Always consult a medical provider before starting any ED treatment.