What is the medicine used to prevent uric acid kidney stones and what are the side affects?

Several possibilitie: Allopurinol is given when high serum uric acid causes urinary stones. It has few side effects, but rarely causes a severe skin condition called stevens–johnson syndrome. Potassium citrate is given high urinary acidity is the main cause of stones. This drug prevents uric acid stones both by urinary alkalinization and by increasing citrate, (stone inhibitor). See below for side effects.

Utica acid stones: Allopurinol is a prescription medication commonly used for gout prevention as well as uric acid stone prevention. Skin rash and GI upset are the most common side effects. Sodium bicarbonate (sodium bicarbonate) and other alkalinizing agents are also used.

Alkanising agent: Alkalinising agent like polycitra, also Allopurinol if uric acid level in blood is high, Allopurinol can cause rash and itching also can affect liver enzymes.

Uric acid stones: Allopurinol and febuxostat are used; side effects include rash, allergy, liver irritation. Work on diet: avoid organ meats; fatty meats and alcohol will elevate uric acid. Avoid these. Also, drink at least 3 liters fluid per day - this dilutes uric acid excretion - and incline diet successfully to mostly whole grain, fruit, and veggies, and nuts, using egg white and fish for protein