'Now slim Strips' and birth control...?

I'be bought some 'Now Slim Strips' ... they are paper thin sheets (like that chewing gum you used to be able to by) that dissolve on your tongue... your meant to place one on your tongue when you feel like snacking and it suppresses you hunger.. there are no precautions on the packaging or their website about the effects on the Contraception.. (AKA the pill).... but i wanted to make sure to see if anyone else has found that they are detrimental to birth control... so yer, they're hunger suppressants... not diet pills lol. Any other experiences while taking these strips would also be appreciated. many thanx.