There are some other meds that have the effect you describe,too, if you don't take the med the same time daily, you feel funny, get brain zaps, etc.
Why you need to make sure you aren't going to run out. My pharmacist will give me a few in a bottle until my doc answers him if I don't have a refill available. It just comes out of the quantity ordered when I do get it filled.
Important to note, one person may get the "zaps", another one may never experience them. Don't know why.
Always remember when going off a med, to take your docs advice and wean, or taper off them very gradually. Not all drugs, or all people have withdrawal, but it is not fun.
When your med doesn't seem to be working anymore, you need to talk to the doc or docs if you have a few. Maybe something else is going on with you. Maybe they will increase your dose, or switch you to something else, or add something onto it.
For me, and it seems for many on the forum, we don't get on a drug, feel relief and it lasts indefinitely. That's why we have to see the pdoc for those 15 min medication adjustment appts. If you feel you can't wait, tell them its an emergency, tell them you will take a cancellation. Be flexible. I call about a half hour after they come in, and they are usually very happy to fill a cancelled appt.
Never be afraid to speak up to your pdoc in your own behalf. Tell him exactly what your problems are, concerns are, or he won't know. Even if he disagrees, you have the right to respond. It isn't arguing, its discussing your treatment plan. Even if you do "lose it", you are in the right place and he is used to it.
Try to have your head on straight when you see the doc. Keep an index card of complaints or questions and start it a few days ahead of the appt. Don't leave till you get them all covered. If you have a lot, then you can review and prioritize them in the lobby, and be sure to tell the doc, I have a lot to ask you about today.