Excessive amounts of oxytocin?

Yes, death.

i wouldn't know - i'm not sure that it's a very common thing.

in theory, though, you would probably be in a pretty blissful state.

I had a knee reconstruction and used Oxycodone (otherwise known as oxycontin). Be warned it makes it extremely hard to go to the toilet. Also, make sure u don't take too much because it is very easy to suffer form withdrawal symptoms. My symptoms were Shivering, feeling cold and i had a very sore knee!
Some of the symptoms of an overdose: breathing will stop or it wil be reduced, fall into unconsciousness, your circulatory system will collapse, cardiac arrest ( heart attack) and eventually death will occur. Look out for the skin to start going cold and there will be a blue tinge to the lips. This means that they are not getting enough oxygen.
If an overdose if suspected being the person to an ED asap!
so yeah in short, if you take an excessive amount of Oxycontin the chances are very high that death can occur.
EDIT: sorry i thought this question was about Oxycontin.
My bad....

Lactation (activation of the milk letdown reflux), uterine contractions. Oxytocin is released in small amounts in high association with feelings of love. It is one of the two hormones manufactured by the posterior pituitiary, the other being ADH.

Oxycontin is a drug. Oxytocin is a naturally occuring endogenous hormone.