That's what I tried to tell my brother's fiancé.. The conversation went at follows:

Me: #1 is False
Her: Age and weight matters.
Me: Yes... but Medication directions depend on the weight age and gender... the weight age and gender don't depend on the medication directions.
Her: It goes either ways. I was right obviously
Me: It doesn't go either way. A medication does NOT dictate what your weight age and gender are.. Your weight age and gender dictate the how and how much of the medication is taken.
Her: Take 4 years of pharmacology.
Me: I'm telling you that the medication I am taking is NOT going to change my weight age or gender, but if my weight age and gender changes they're going to change my medication.
Her: There is certain types of medication out there that does it though. There is medication for different diseases that does crazy . I've been in nursing for 4 years I know every disease and medication that's out there.

I just had to stop after that.. I wanted to be like "28 years of the english language tells me that THIS STATEMENT IS FALSE!" but I just walked away...