The intravesical instilation of bacillus Calmette-Guérin (BCG) is a widely used and efficacious procedure for treatment of intermediate to high-grade superficial bladder cancer. The occurrence of osteoarticular side effects is infrequent compared to the number of administrated doses, and reactive arthritis is included within these effects. We present the case of a 54 years old HLA-27 (+) male, who developed reactive arthritis featuring asymmetric olygoarthritis and dactylitis after the second intravesical BCG instillation, which was resolved with administration of Etoricoxib and Isoniazid.