Your search for "Effervescent tablet" revealed the following:

On Sale from £32.24 Regular price £40.00 Sale
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Sale price £90.59 Regular price £130.00 Sale
Sale price £33.99 Regular price £40.00 Sale
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On Sale from £51.19 Regular price £70.00 Sale
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Sale price £34.95 Regular price £50.00 Sale