surāmeraya -majja-ppamādatthānā veramaṇī sikkhāpadam samādiyāmi: "I take upon myself the vow to abstain from taking intoxicants and drugs such as wine, liquor, etc. since they lead to moral carelessness." This is the wording of the last of the 5 moral rules (s. sikkhāpada) binding on all Buddhists.

Buddhist Dictionary, Manual of Buddhist Terms and Doctrines, by NYANATILOKA MAHATHERA