When presenting info to someone seeking medical information, you want a template that presents your content cleanly and efficiently. Lighter colors are recommended with good organization by topic. People are naturally looking to help others when it comes to medical conditions, so straightforward social integration into your site would help your site grow and aid your viewers.
Premium Responsive Medical Theme
White Medical Website Template
Medical Pro Responsive Template
These are excellent but if they are too pricey check out Elegant Themes. They provide cheap themese for one low price with super customer support.