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The objective of this work is to study the effect of synergy between halide ions (Cl-, Brand I- ) and piroxicam which is a drug molecule with anti-inflammatory properties proposed as a corrosion inhibitor copper in nitric acid medium using the gravimetric method. The experimental results show that the inhibitory efficiency increases considerably with the addition of halide ions on piroxicam. The observed inhibitory efficiency reaches more than 94 % in nitric acid medium (1 M) with the addition of iodide ions to piroxicam at 323 K. The presence of I- ions considerably improves efficiency compared to Brand Clions. So the classification of the halide ions studied, in the sense of those which could help to improve the inhibitory efficacy of piroxicam is I- > Br- > Cl-, which confirms previous studies. [ABSTRACT FROM AUTHOR]