" What if it is a poison the friar has given me so he won't be dishonored for performing our marriage? And yet i think not, for he has always been a holy man. But what if I wake too soon? Locked in our family tomb with corpses long dead? (She shudders and takes the potion) Romeo I come! This do I drink for thee! (Juliet falls back upon her bed)"
That was when she took the potion. If you were looking for when Juliet sees Romeo dead though....
"What's here? A cup closed in my true love's hand? Poison, I see, has been his timeless end. What, drunk all, and left no friendly drop to help me follow after? I will kiss thee. Maybe some poison does remain - Oh, thy lips are warm! (She hears noises of people coming) I'll be brief. Oh happy dagger! (She takes Romeo's dagger from his belt) There, rust, and let me die. (She stabs herself and dies)."
I was Juliet's understudy and Lady Capulet, Juliet's Mother, so i love this play!! Hope i helped. xD