What Viagra is
Viagra is a PDE5 inhibitor. The original PDE5 inhibitor, with the same vascular mechanism as tadalafil but a considerably shorter duration.
Class and mechanism
Viagra is a PDE5 inhibitor. The original PDE5 inhibitor, with the same vascular mechanism as tadalafil but a considerably shorter duration.
Where it sits
Wellbeing compounds are grouped by the outcome they are studied for rather than by shared chemistry, so the class column varies widely across the group.
Other names
Viagra is also written as Sildenafil. The same molecule appears under more than one name, which is worth knowing when comparing listings between suppliers.
Others in the wellbeing compounds range
Viagra sits in the wellbeing compounds group. The compounds below share that grouping, which is the useful starting point when comparing one against another: same group means the comparison is like for like, different group usually means it is not.
| Compound | Class | Listings | From |
|---|---|---|---|
| Melanotan II | Non-selective melanocortin agonist | 3 | £15 |
| PT-141 | Melanocortin receptor agonist | 2 | £20 |
| Melanotan I | Selective MC1R agonist | 1 | £50 |
| Selank | Anxiolytic heptapeptide | 1 | £30 |
| Semax | ACTH(4-10) analogue | 1 | £30 |
| Kisspeptin-10 | KISS1R agonist | 1 | £50 |
Is it held in UK stock?
Stock held in the UK ships domestically, with no customs step. The product page carries live stock rather than a cached figure.
Viagrain stock£12
Availability checked 2026-09-09. The product page carries live stock.