Pyrazolone Derivatives (phenylbutazone, oxyphenbutazone, and possibly dipyrone): Concomitant administration with aspirin may increase the risk of gastrointestinal ulceration.
<Pyrazolone Derivatives, effect, aspirin>, <phenylbutazone, effect, aspirin>, <oxyphenbutazone, effect, aspirin>, <dipyrone, effect, aspirin>