unless you forced the person to take the RX medicine, i don't see how any of those 'charges' would ever lead to a conviction. the injured party could sue you, but again, i doubt any judge or jury would render that decision based on giving someone a pain pill.
and nothing in that scenario comes close to what 'intent to distribute' applies to.
that being said, i bring ibuprofen, immodium (aka butt putty), sudafed, benadryl, and gold bond MEDICATED!