Is Being Drunk a Defense to a Crime?

Article 15 first explains that alternative circumstances are those taken into account as aggravating or mitigating "according to the nature and effects of the crime and the other conditions attending its commission". They are relationship, intoxication, and the degree of instruction and education of the offender. On intoxication, it says:

So there are two outcomes:

In both cases the person is still liable for the crime. Intoxication only affects where the penalty falls.

The fact of intoxication. In Ilayat v. People (2025), the Supreme Court En Banc said it was settling "the apparent inconsistency between the Revised Penal Code and existing cases." It set out two steps:

1. Intoxication must be clearly established. There must be evidence of acts or circumstances showing intoxication, "i.e., slurred speech, stumbling, or a swaying walk, other than mere consumption of alcohol." The amount of alcohol is not enough either, because alcohol tolerance differs from person to person. In the Court's words, "proof of alcohol intake alone, regardless of quantity, does not ipso facto equate to intoxication."
2. Then the court must apply Article 15. Once intoxication is established, the court is "mandated" to treat it as aggravating when it is habitual or intentional, and as mitigating when it is not habitual or subsequent to the plan to commit the felony.

The Court added: "There is no need for the accused to prove that the alcoholic drinks affected his/her mental faculties before he/she can avail himself/herself of it as a mitigating circumstance." In the case itself, the accused gave no proof of the fact of intoxication, so it was not considered in his favor, and his homicide conviction was affirmed with modification.

Earlier decisions, such as Bacerra v. People (2017), required more: proof that the accused's "mental faculties and willpower" were impaired so as to diminish his capacity to understand the wrongful nature of his acts. Bacerra said: "The bare assertion that one is inebriated at the time of the commission of the crime is insufficient." Ilayat clarified the rule. It still requires proof of intoxication, but not proof that the drinks affected the mind before intoxication can be mitigating.

Article 15 does not make it one. It treats intoxication only as a circumstance that changes the penalty. Full defenses, such as self-defense, have their own requisites under Article 11. For crimes under the Anti-Violence Against Women and Their Children Act, Section 27 of Republic Act No. 9262 says that being under the influence of alcohol, any illicit drug or any other mind-altering substance "shall not be a defense under this Act."

These are made-up examples to show how the rules work. They are not advice for any real case.

Lito drank two bottles of beer with friends, then got into a fight and injured another guest. At trial, his only proof is that he drank. Under Ilayat, drinking alone is not proof of intoxication, so it cannot lower his penalty.

Ernie had been drinking all evening at a fiesta. Witnesses say he was slurring and stumbling when he hit a neighbor over a past quarrel. He does not drink regularly and had no plan. If the court finds these facts, intoxication is established and, under Article 15, it is mitigating.

Bong plans to confront a rival, then drinks a bottle of gin "for courage" before going. If the court finds the drinking was part of the plan, intoxication is intentional and Article 15 treats it as aggravating.

They move the penalty within the range set by law for the crime. The list of aggravating circumstances is in Article 14, and the glossary entry on aggravating circumstances explains the idea. Which circumstances apply in a case, and how they offset each other, is decided by the court.

See also the topic page on criminal liability basics.

Talk to a lawyer if you are accused of a crime committed while drinking, or if you are a victim and the accused claims he was drunk. Whether intoxication is proved, and whether it is habitual or intentional, depends on witnesses and other evidence. If you cannot afford a lawyer, see Free legal help in the Philippines for the Public Attorney's Office (PAO) and other options.