Seems silly to throw them out if you're going to be getting a refill on your prescription anyway? Surely, like you suggested, having someone hold on to them for you should be a sufficient safety precaution if they don't trust you to have all these meds in your possession. I understand they have your safety in mind, but is there no room for negotiation with this? It all sounds very controlling.

Also, 600 DOLLARS?! Seriously expensive. I know I complain about the fact that here in the UK if you want decent therapy you have to pay privately, but at least meds are cheap (£7.20 per script on NHS) or even free if unemployed/on benefit.