Hi Brenda...this from Medscape
Combination immunotherapy, specifically the use of BCG plus interferon alfa 2b, is highly effective. About 60% of patients who fail to respond to BCG can be rescued with BCG plus interferon (O'Donnell, Krohn, & DeWolf, 2001). The standard dose is 50 mg to 81 mg of BCG plus 50 million units of interferon alfa 2b. Treatments are given weekly for 6 weeks, with maintenance using up to 3 weekly instillations at 3 or 6 months, and then every 6 to 12 months. The dose of BCG is reduced to 1/3, 1/10, 1/100 as needed to prevent increased side effects. While we try to avoid giving a second 6-week course of BCG to patients who have previously received BCG because they are at risk of immunosuppression, the addition of interferon appears to reduce this risk.
And if that doesn't rescue you ..you know what to do.
Best to you