Systemic absorption of Uniren Spray 1% w/w is low and hence the risk of an interaction is small. There are no known interactions with Uniren Spray 1% w/w but for a list of interactions known with oral Diclofenac the Summary of Product Characteristics for oral dosage forms should be consulted. Concurrent use of Aspirin or other NSAIDs may result in an increased incidence of adverse reactions.