Can pitocin (oxytocin) produce a bad reaction?

Generally safe. Pitocin (oxytocin) can make you contract too much. To prevent this, usually it is started at a low dose and increased slowly until the contractions are close enough together to open the cervix. Not everyone needs Pitocin (oxytocin) in labor. It is used when the contractions a woman is having on her own are not opening the cervix.

Related Questions

If I had a bad reaction to pitocin (oxytocin) for inducing labor will I have a similar reaction to cytotec I've been told to take before a dnc for a miscarriage?

Not related. Cytotec has potential side effects but it is not similar to pitocin (oxytocin).
No. Oxytocin (pitocin) has nothing to do with Misoprostol (cytotec). Reaction to the one does not predict reaction to the other drug. Tell your doctor and anesthesiologist of all past drug reactions. I am sorry for your loss.