Yep, they're not very convenient as you have to wait 2 hours after eating, 1 hour before, can't take with milk products, can't take before bed etc etc, the first time I used them they didn't help at all, mainly because I couldn't find a regular time to take them, this time I think they've helped a bit. Make sure you take them exactly when your doctor's told you to - they won't make any difference if you only take them when you feel like it.
Also if you haven't had any improvement in about 3 months (I think that's the time you're supposed to leave) go back to the doctor and ask for stronger stuff - they always start with weaker medication, and work up if it doesn't work. Hopefully it'll be fine if its only mild acne you have. Anyway, good luck!