Allopurinol

The risk or severity of bleeding can be increased when Allopurinol is combined with (R)-warfarin.

The risk or severity of bleeding can be increased when Allopurinol is combined with (S)-Warfarin.

The risk or severity of bleeding can be increased when Allopurinol is combined with 4-hydroxycoumarin.

The risk or severity of bleeding can be increased when Allopurinol is combined with Acenocoumarol.

The risk of a hypersensitivity reaction to Amoxicillin is increased when it is combined with Allopurinol.

The serum concentration of Azathioprine can be increased when it is combined with Allopurinol.

The risk or severity of rash, hypersensitivity reaction, Stevens-Johnson syndrome, and Cutaneous drug reaction can be increased when Allopurinol is combined with Bendamustine.

The serum concentration of Capecitabine can be decreased when it is combined with Allopurinol.

The risk or severity of Stevens-Johnson syndrome can be increased when Allopurinol is combined with Carbamazepine.

The risk or severity of bleeding can be increased when Allopurinol is combined with Clorindione.