I know its not the same.
Mirtazapine has a sedative effect. Tends to make me tired. Not really bothered if I am alert for a bit after taking the crushed pills as the method is relatively quick anyway
From the article linked above about the cocktail:
"Following the research of this wiki's authors, we found that diazepam in high doses can indeed act as a set-off to the cardiac poisoning-properties of chloroquine. Nevertheless, this may only occur in high doses."
It looks like the benzo (diazepam) isn't just used to make you sedated but aids in the actual poisoning by chloroquine. It also states:
"If you only have access to chloroquine phosphate, then ingest 17.5 grams instead of the 11 grams mentioned above." You wrote you have 100 pills. Hopefully you have checked the doses add up to the proper amount needed. As three others have said, plus myself, please read up on this. Chloroquine alone makes someone tired so it would appear more of it is required without the other listed medications and sedation isn't the only issue at hand. Mirtrazapine and Kalms don't work the same in regards to the poisoning itself as they are not in the same drug classes.
@chrijo is right.