Final answer:
Juliet's fears about taking the potion include it being poison, waking alone in the tomb, and the potion not working, all of which reveal her anxiety and the risks involved in her and Romeo's plan.
Step-by-step explanation:
In William Shakespeare's tragedy Romeo and Juliet, Juliet harbors several fears as she prepares to take the potion concocted by Friar Lawrence. The first fear is that the potion might actually be poison that will permanently end her life, an understandable worry given the devious and secretive nature of their plan. She also fears the possibility of awakening alone in the dark, surrounded by the bones of her ancestors and the decaying body of Tybalt, which could drive her insane.
Lastly, Juliet dreads the thought that the potion's effects may not work at all, which would leave her forced into a marriage with Paris, ruining her unity with Romeo forever.