No, alcohol and recreational drugs to not at all effect the pill. The only way they can effect the pill is by impairing a person's ability to always take their pills on time. Actually consuming alcohol will not lessen your pills efficacy at all.
Epilim, however, is an anticonvulsant, and such medications may lessen the effects of the pill. A few clinical studies have found these results:
"The British Committee on Safety of Medicines received at least 23 reports of pregnancies due to OC failure attributed to drug interactions with anticonvulsant drugs, with phenytoin implicated most often. There are 2 proposed mechanisms by which these agents interfere with OC effectiveness: altered reabsorption of estrogenic substance from the gastrointestinal tract and enhanced metabolism of the estrogenic component due to microsomal enzyme induction. The 1st mechanism helps to explain the role of antibiotics (with the exception of rifampin) in OC failure. The major effect of the anticonvulsant drugs is to reduce the circulating level of contraceptive steroids by increasing the rate of hepatic metabolism, and women using low-dose pills may be at greater risk. Sufficient data exist to conclude that drug interactions can result in breakthrough bleeding and OC failure. Medical practitioners, including pharmacists, should be aware of this potential problem when prescribing or dispensing implicated medications to patients taking OCs, particularly to patients taking OCs with a low-dose estrogen component."
I would talk to your doctor about taking both anticonvulsants and birth control pills at the same time, since there may be some interaction.
