Question about Buddhism and psychiatric medication.

I have bipolar disorder and I take psychiatric medication for it. The meds work wonderfully and I'm able to live a normal life because of them. I plan on taking them for the rest of my life.

My question is: what are the spiritual ramifications of taking this medicine? Since Buddhism is very concerned with the mind, does the fact that I have to take this medication hinder me in any way? I lived with this illness for ten years untreated and it was a living hell. I had delusions and hallucinations to go along with the terrible mood swings. It seems like it would be better for me at least with regards to karma to be taking this medication. I'm much less likely to do anything that would hurt me now.

However, it seems like liberation in this lifetime is not in the cards for me. You could make the argument that since my mind is medicated I'm not in my natural state. How could any liberation attained under such circumstances be real? The opposite might also be claimed. The medication actually makes my brain work the way it is supposed to work when it is healthy. Therefore, the reality the non-medicated state of my brain perceives is not the true one.

I've also thought of it in the following way and this may be getting away from Buddhism and into more mystical areas of belief. The brain is matter and the medication that I take to treat it is also material. When it comes to spirit we are talking about something that is supposed to be something other than a part of the physical, material world. Therefore, any liberation or spiritual insights gained in either a non-medicated or medicated state of mind are equally valid as they are derived from something other than the physical brain.