No, it won't hurt this way.

Still, there are potential issues:

1) waste of time - if it does not help, and you keep praying, you will be wasting time. Just as if you go see doctors and they are not helping, you are wasting time. If you are refilling prescriptions, and the medications are not helping, you are wasting time. If you pay for the medications, you are also wasting money. If you have government-funded medications, you are still wasting time - in the best case scenario, in which the medications are not helping, but are not giving bad side effects, either.

So there is always the issue of time, and ultimately, on the most general and high level, life is about how you use your time and time is a finite resource/

2) waste of effort and getting exasperated - if you keep praying and it does not help, you will get frustrated and exasperated. Since so many people pray, it is reasonable to conclude that prayers are not very effective, because otherwise the prevalence of bipolar in the non-prayers would have been way higher than in prayers. I do not think anybody has studied it formally, but just from the forum, many people have bipolar and pray and are still symptomatic. Just as many people take medications and are symptomatic. So neither tool seems to work great.

3) feelings of guilt - probably the most important potential issue.

If you take a medication - say, Lamictal - and it does not work, you do not feel that you are taking it in a wrong way, not applying enough effort, not doing it sincerely enough, with less than 100% devotion or dedication, etc. etc. As long as you take it, if it does not work, you know that it does not work - not that you caused it not to work. With prayer, people are bound to feel that they have not been doing a good enough job, which can lead to guilt, hopelessness, beating themselves up, and other such bad things. Since bipolar people have a tendency to beat themselves up on their own, the danger of the prayer method in exacerbating the natural tendency to beat themselves up and feel guilty is very real.

In general, there is no such thing as a free lunch, so even something as seemingly innocuous as "a few words" can have costs and consequences.

All of the above applies to using prayer as one of many tools, not to the exclusion of other tools.

If, in addition, prayer is used to substitute for other tools, then there is also the opportunity cost - the possible benefit from using other tools (does not have to be psychopharmacology, but maybe simple sunlight and additional iron in the diet) that is foregone by putting all the eggs into the prayer basket.