I was terminated because of medical problems and medication. Does that qualify for wrongful termination?

If you have a condition which substantially limits a major life activity, you may be a qualified individual with a disability for purpose of the Americans With Disabilities Act, which prohibits discrimination against disabled people. Short of that, I know of no principle of law that says you can't fire someone because they take medication and you think it might interfere with their job. If you're not disabled or perceived as disabled, I don't think their dismissal of you is unlawful.

Check with a South Carolina employment lawyer who will be able to advise you on all the facts and circumstances as well as familiarity with SC law. I'm just stating the general principle that at-will employees can be fired for any reason or no reason, but not reasons the law finds impermissible, like disability discrimination. I don't hold South Carolina licensure so don't take what I say here as legal advice.

Good luck.