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The importance of pharmaceutical chemistry
1 You can give them a fresh suspension and advise them to keep it in the fridge. It will still hydrolyse but much more slowly.
2 Erythromycin is acid-labile, that is it is degraded by acid. It is even broken down by gastric acid, which is why erythromycin is delivered orally as an enteric coated tablet or as a more stable ester compound.