We know that one is to drink until they fall down/asleep:
H. Megillah 2:15
כיצד חובת סעדה זו. שיאכל בשר ויתקן סעדה נאה כפי אשר תמצא ידו. ושותה
יין עד שישתכר וירדם בשכרותו
What is the nature of our obligation for this feast? A person should
eat meat and prepare as attractive a feast as his means permit. He
should drink wine until he becomes intoxicated and falls asleep in a
stupor.
Furthermore we know that one must safeguard their life against all dangers.
H. Roseah uShemirath ha-Nefesh 11:4
כל מכשל שיש בו סכנת נפשות מצות עשה להסירו ולהשמר ממנו ולהזהר בדבר יפה
יפה. שנאמר (דברים ד ט) "השמר לך ושמר נפשך". ואם לא הסיר והניח המכשולות
המביאין לידי סכנה בטל מצות עשה ועבר ב(דברים כב ח) "לא תשים דמים"
it is a positive mitzvah to remove any obstacle that could pose a
danger to life, and to be very careful regarding these matters, as
Deuteronomy 4:9 states: "Beware for yourself; and guard your soul." If
a person leaves a dangerous obstacle and does not remove it, he
negates the observance of a positive commandment, and violates the
negative commandment: "Do not cause blood to be spilled."
Given that alcohol related falls pose a serious threat to life, Rabha holds that one must besot themselves only from the safety of פוריא, leaving no obstacle between the drinker and his destination.