Cauterizing a Vein
Scholars have said that if one dreams of cauterizing one of his veins, it may indicate that he will be blessed with a female slave, or he will get married, or a stranger will see his wife. As for theriac, it was mentioned that Ibn Sirin disliked seeing it in a dream.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.