In Horton v. State, 258 Ga. 489, 491 (8) (371 S.E.2d 384) (1988), the Supreme Court of Georgia held that voluntary intoxication was not a defense to a crime unless the intoxication resulted in altering brain function so as to negate intent, and even then the alteration must be more than temporary. Mathis offered no evidence at trial concerning such permanent alteration of his brain function. The trial court charged the jury carefully that intent was an essential element of the state's case and that the state was required to prove intent beyond a reasonable doubt. When considered in conjunction with this charge on intent, the trial court's charge on voluntary intoxication was correct and sufficient. Sydenstricker v. State, 209 Ga. App. 418, 419-420 (2) (433 S.E.2d 644) (1993).