studying about drugs

i have a crossword puzzle and stuck need
a 11 letter word that describes psychological depencene on a drug

need a 11 letter word for : effect some drugs have when mixed together
i got: sideaffects

need 9 letter word blocks a persons abilitys to perceive pain; i got narcotics

are these right?

2 answers

I don't know the first answer.

The other two are correct -- except it's side effects.
We cannot tell without knowing which letter you already have for each word. I tried my Medical Dictionary for the first word with no luck; all the words either had 10 or 12 letters!

Sra