Gentamycin
Hydantoins (e.g. phenytoin or Dilantin) may decrease the effectiveness of contraceptives, including oral contraceptives (birth control pills), progesterone implants (Norplant), and progesterone injections (Depo-Provera).
Drinking prune juice does not decrease the effectiveness of birth control pills. There is no evidence to suggest that prune juice interacts with hormonal contraceptives in a way that would reduce their efficacy. However, it's always best to consult with a healthcare provider regarding dietary choices and their potential impacts on medication.
Hormonal (oral contraceptives) tablets generally have an enteric coating, meaning they are designed to dissolve in the intestine. If you chew the tablet, your stomach acid will digest the hormonal active ingredient and decrease its effectiveness.
Taking Plan B can decrease the effectiveness of some birth control methods, such as hormonal contraceptives, if taken too close together. It is recommended to use a backup method of contraception for at least a few days after taking Plan B to ensure continued protection against pregnancy.
Oral contraceptives typically will decrease acne and, over time, may decrease excess facial hair. Women with abnormally low estrogen levels in their body may see improvements in skin quality in the vulva and vagina after strating combination oral contraceptives. Some women taking combined oral contraceptives (those that contain both estrogen and progestin) may get brown splotches known as melasma. Similar skin changes may happen due to estrogen increases during pregnancy.
Drugs are administered that will decrease organ rejection after surgery.
There are no contraceptives on the market that increase body hair. Some may decrease body hair.
No, amoxicillin will not decrease the effectiveness of the Depo-Provera to prevent an unintended pregnancy. Since the Depo-Provera shot bypasses the absorption phase in the gastrointestinal tract required by oral contraceptives, antibiotics such as amoxicillin will not interfere with the effectiveness of the Depo shot.
If NuvaRing is out for less than three hours, there's no worries about effectiveness. Just rinse it in lukewarm water and reinsert.
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I have also wondered this question and with the research that I have done, it says that neither affects the effectiveness of birth control pills
Stimulants like caffeine can decrease the absorption of vitamin C in the body, leading to lower effectiveness of the vitamin.