In act 4 does the Friar give Juliet a drug or a potion.

http://nfs.sparknotes.com/

This is the best Shakespeare site online, I believe. Find the play you want, then the act and scene. You'll find modern-day English on the right side of the page.

Read carefully.

He gives her a potion, we know this because he has a specialty in herbs and plants and in his previous soliloquy he tells us he knows what plants can stop the heart and such.

Also, in act 5 - scene 3 line 244 he says he gave her a sleeping potion. :)

In Act 4 of Shakespeare's play "Romeo and Juliet," the Friar gives Juliet a potion, not a drug. The potion is intended to make her appear dead temporarily so that she can escape her arranged marriage to Paris and be reunited with Romeo. The Friar's plan is for Juliet to drink the potion and be placed in the family tomb, where she would be discovered by her family and Romeo would come rescue her.