As far as I know, all antibiotics lower the effectiveness of Birth Control. Just use a back up or don't have sex until a few days after you have stopped taking Vantin.
Steroids do not affect how well the birth control pill works.
It does not affect the pill.
Nasacort and other inhaled steroids do not affect the birth control pill
No, clindamycin topical for acne does not affect the birth control pill
X-rays do not affect how well the birth control pill works.
Asprin doesn't affect birth control.
Stress does not affect how well the birth control pill works. Stress can affect periods when you're not on the pill.
no
No
No
no
No.