It's OK to skip now and then. If any trace blood shows up in the test on the day they plan to do BCG they will skip it that week.
Usually, it is six weeks, then a break for three to six months and then 3 weeks, then a break, then 3 weeks.
The maintenance doses are very important.
This is from
Dr. Lamm's web site:
(Click the link to read the full article, which is well worth your while)
The BCG Schedule generally used is my 3 week maintenance program that was found in the Southwest Oncology Group study to markedly reduce not only tumor recurrence but also disease progression when compared to 6 week induction BCG alone. I have modified the regimen as follows: Full strength BCG is used for the initial 6 instillations, often with the addition of skin vaccination as used in my original studies. The dose is reduced if needed to avoid side effects. Maintenance BCG (once a week for 3 weeks) is begun at 3 months using 1/3 dose BCG, unless no side effects were noted during induction. 3 week maintenance is repeated at 6, 12, 18 and 24 months, and then at years 3, 4, 5 and 6 followed by every other year for years 8, 10 and 12. The extended maintenance beyond 3 years is used only for patients who are at increased risk for progression due to high grade tumor, CIS, or lamina propria invasion.
Mike