Your search for "Effervescent tablet" revealed the following:

Sale price £32.49 Regular price £40.00 Sale
On Sale from £39.69 Regular price £50.00 Sale
Sale price £33.99 Regular price £40.00 Sale
Sale price £13.99 Regular price £20.00 Sale
Sale price £23.99 Regular price £30.00 Sale
Sale price £43.99 Regular price £50.00 Sale
Sale price £13.99 Regular price £20.00 Sale
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Sale price £27.18 Regular price £30.00 Sale
Sale price £24.79 Regular price £35.00 Sale