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Since you have not mentioned the Indication, I am assuming that the Oxytocin was self administered without medical guidance. Oxytocin is generally administered as an infusion (slow dosages, not a rapid injection).
I would say it was not a smart move from your side. Luckily this is rather a safe medication. So unless the symptoms are persisting you should be okay. Cytotoxic can lead on to arrhythmias and blood pressure changes. So if you still have symptoms and/or if there is feeling like irregular beat, skipped heart beats, syncope, weakness or any unusual symptoms you should get medical help urgently
Hope this helps
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