Your search for "Effervescent tablet" revealed the following:

On Sale from £38.79 Regular price £40.00 Sale
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Sale price £89.59 Regular price £130.00 Sale
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Sale price £85.80 Regular price £130.00 Sale
On Sale from £34.92 Regular price £40.00 Sale
Sale price £47.99 Regular price £70.00 Sale
Sale price £149.98 Regular price £200.00 Sale
Sale price £70.24 Regular price £110.00 Sale
Sale price £33.99 Regular price £40.00 Sale