Health wish

I never know what to say to someone who's sick. "Get well soon" sounds like a command, with an implied "...or else!" "I hope you feel better" sounds like it's an imposition to me and I'm impatient. I could just go with "take it easy", i.e. banal advice, but I feel like it should also involve something like "good luck" or "best wishes", an expression of semi-superstitious beneficence. "Gesundheit" does literally mean "health", but obviously that already has a more specific application. Any other ideas?