If your partner is on meds that make him too groggy to drive, then he definitely is unsafe, at least on those particular meds. Sounds like it is time to get him to a different doctor immediately so his meds can truly be assessed and adjusted. That might go a long way to getting him to a place where he is safe to drive.

My husband went through a phase of being too groggy to drive and he was definitely unsafe. Fortunately, his doctors have worked to find him med combinations for his pain that don't have that severe an effect, but he still doesn't drive much anymore. He just worries he'll find himself in that kind of situation and doesn't want to put anyone else's life at risk. I get up and drive him into work at 4AM each and every morning, and my son goes to pick him up. He's fine for short trips around town, etc., but work is a 30 mile trip, and he would rather not put others at risk. Yes, it is a burden to have to drive him, but I'd rather have him alive, safe, and comfortable. It's just part of being a family as far as we see it.