Hi, Deborah:
Your doctor sounds like a smart guy. If the minocycline is manufactured by Lederle, it may be mildly effective for you; otherwise I would expect it to do nothing at all. The acidophilus is to offset the bad effects from taking the antibiotic, so take them at different times of day (suggest antibiotic early mornings well before breakfast, and acidophilus well after lunch or with dinner). The dosage of L. acidophilus is not very critical because in a healthy tract they will propagate by the millions, but the right substrates must be present and many suggest using FOS (fructoogilosaccarides or something like that), which can be a bad thing when trying to eliminate Kp as they grow on it, also. Twenty to fifty million organisms daily to start is good, if the doses are measured this way (it might be 5mg-20mg with some filler--make certain that it is starch-free).
The calcium you should be supplementing with should not be taken with the antibiotic, but at night with plenty of magnesium, zinc, and selenium; the vitamins still with meals during the day.
Best of luck, and please let us know how you are doing after a few weeks,
John
