An
antiseptic used for the treatment of recurrent infections of the urinary tract; it acts by being transformed to
formaldehyde. It is available as tablets without a
prescription, but only from pharmacies.
Side effects: include gastrointestinal disturbances, bladder irritation, and rash.
Precautions: hexamine should not be taken by people who are severely dehydrated or by those with severe kidney disease.
Proprietary preparation: Hiprex.