I just said Adderall is gay, because I just said my relative tried it and it doesn't help him what so ever.
So because a drug didn't affect 1 certain person out of the near-7 billion on the planet means that is useless?
You know that hundreds and hundreds of factors can affect whether or not a drug works as designed? That's why there are "side-effects" and risks for pregnant women taking certain drugs, or people with other conditions and so on/so forth.