Your search for "Effervescent tablet" revealed the following:

Sale price £28.95 Regular price £40.00 Sale
Sale price £87.99 Regular price £90.00 Sale
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On Sale from £79.48 Regular price £90.00 Sale
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Sale price £33.99 Regular price £50.00 Sale
Sale price £54.99 Regular price £70.00 Sale
Sale price £40.80 Regular price £50.00 Sale