Is an anti inflammatory also a blood thinner?

Anti-inflammatories

That's because mixing anticoagulants with anti-inflammatory drugs thins the blood while simultaneously promoting bleeding. That can be as minor as a gum bleed, or as major as a stomach bleed.

How do NSAIDs affect blood clotting?

Aspirin and nonaspirin nonsteroidal antiinflammatory drugs (NSAIDs) inhibit platelet cyclooxygenase, thereby blocking the formation of thromboxane A2. These drugs produce a systemic bleeding tendency by impairing thromboxane-dependent platelet aggregation and consequently prolonging the bleeding time.