There is nothing wrong with either a high libido or a low one so why would there be medicines to change what is natural? Some illnesses and medications are known to affect sexual feelings, so there would be a reason for medication, if there were any that worked and did not have side effects, in those cases. In the case of people like you the thing to do is to manage the differences in libido in a way that feels ok for each person.
If your partner has blocked sexual feelings for some reason, then that it a different thing, and he might be interested to uncover his blocks. If he is feeling under pressure, however, that would increase his reluctance to do anything.
If you know of any medicines that enhance libido, please tell us as we are not aware of any!