Cialis vs Viagra
Cialis vs Viagra
Cialis and Viagra are compared here on the things that actually differ between them: what class each belongs to, what each acts on, how each is supplied and what each costs per milligram. Where the registry has no figure for one of them the row is left out rather than filled in.
Reference only. This page covers what the compound is, how it is presented and how it is handled. It does not give dosing protocols or administration schedules, and it is not medical advice.
Side by side
| Cialis | Viagra | |
|---|---|---|
| Class | PDE5 inhibitor | PDE5 inhibitor |
| Acts on | Inhibits phosphodiesterase type 5, preserving cyclic GMP and thereby smooth-muscle relaxation in vascular beds. Acts on the vascular mechanism, unlike PT-141 which acts centrally. | The original PDE5 inhibitor, with the same vascular mechanism as tadalafil but a considerably shorter duration. |
| Supplied as | Oral tablet. | Oral tablet. |
| Half-life | Long for the class, approximately 17.5 hours. | Approximately 4 hours. |
| Storage | Cool, dry, dark. | Cool, dry, dark. |
| Listings | 1 | 1 |
| Price from | £12 | £12 |
What actually differs
Half-life differs as well: Long for the class, approximately 17.5 hours for Cialis against Approximately 4 hours for Viagra.
