Your search for "effervescent tablet" revealed the following:

On Sale from £69.89 Regular price £90.00 Sale
On Sale from £39.57 Regular price £40.00 Sale
Sale price £66.99 Regular price £90.00 Sale
On Sale from £28.98 Regular price £40.00 Sale
Sale price £69.95 Regular price £90.00 Sale
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Sale price £34.83 Regular price £40.00 Sale
Sale price £79.20 Regular price £90.00 Sale
Sale price £39.95 Regular price £50.00 Sale