Your search for "effervescent tablet" revealed the following:

On Sale from £34.85 Regular price £50.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £33.99 Regular price £40.00 Sale
Sale price £43.79 Regular price £50.00 Sale
On Sale from £37.93 Regular price £40.00 Sale
Sale price £69.99 Regular price £90.00 Sale
Sale price £118.90 Regular price £150.00 Sale
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On Sale from £40.41 Regular price £50.00 Sale
Sale price £89.99 Regular price £130.00 Sale