Can one perform prayer while intoxicated?

First of all, it should be noted that consuming alcoholic beverages and using drugs is forbidden (haram). Therefore, it is unthinkable for a Muslim to drink alcohol or use drugs. However, a person who commits this sin, as long as they do not deny its prohibition, is still considered a Muslim. Thus, they are still obliged to perform acts of worship. However, since intoxication affects a person's consciousness, prayers performed in such a state are not valid. Allah the Exalted says, “O you who believe! Do not approach prayer while you are intoxicated until you know what you are saying.” (an-Nisā, 4/43)

Undoubtedly, supplication and worship require awareness and understanding. For this reason, in addition to being Muslim and having reached puberty, being of sound mind is a condition for all acts of worship. For acts of worship to be accepted, they must be performed with the intention of worship and sincerity. Therefore, anyone who is going to pray, fast, or supplicate must be sober enough to know what they are saying and doing, and must be in their right mind. In this regard, although it is forbidden, if a person who has consumed alcohol or used drugs is not so intoxicated that they do not know what they are saying, in other words, if they are conscious enough to know what they are doing and reciting, they are required to perform their prayers. There is no specific waiting period for this.

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu