Your search for "Effervescent tablet" revealed the following:

On Sale from £39.57 Regular price £40.00 Sale
On Sale from £37.95 Regular price £45.00 Sale
Sale price £136.20 Regular price £150.00 Sale
On Sale from £39.94 Regular price £50.00 Sale
Sale price £89.90 Regular price £120.00 Sale
On Sale from £29.10 Regular price £40.00 Sale
Sale price £33.45 Regular price £40.00 Sale
Sale price £30.96 Regular price £40.00 Sale
On Sale from £42.80 Regular price £60.00 Sale