There is no upper or lower weight limit for Depo Provera effectiveness.
Alcohol does not affect how well Mirena works.
Anti-inflammatory medications do not affect how well NuvaRing works.
weight affect performance for many reasons, if you are heavy weight you can't run faster, but it's good as well if you are heavy weight nobody can tackle you in football.
Cortisone does not affect how well the birth control pill works.
Augmentin does not affect how well the birth control pill works.
Meclazine does not affect how well Implanon or Nexplanon works.
Tylenol does not affect how well Depo Provera works. No pain relievers affect Depo provera.
Losing weight at a fast pase is generally hard. One dieting program out there, that actually works quite well, is the HCG dieting program. It works in only 44 days.
Illness does not affect how well Depo Provera works.
Yes, it doesn't affect how well warfarin works.
Paracetamol does not prevent pregnancy, and it does not affect how well birth control works.
Weight watchers is one of the most well known programs for weight loss and there have been a lot of people who say that it actually works.