Joseph Emil Klug appeals pro se the sua sponte dismissal of his complaint. See *938 42 U.S.C. .§ 1983. The district court dismissed Klug’s complaint for failure to exhaust administrative remedies. Id. § 1997e. We affirm.

The district court did not err by sua sponte dismissing Klug’s complaint that the Inmate Handbook for the Sex Offender Management Program contains over-broad and vague prohibitions of certain materials. Under the Prisoner Litigation Reform Act of 1996, “[n]o action shall be brought with respect to prison conditions under section 1983 of this title ... by a prisoner confined in any jail, prison, or correctional facility until such administrative remedies as are available are exhausted.” Id. § 1997e(a). The Bureau of Prisons provides an administrative process to remedy prisoner complaints, and Klug alleged that he had failed to exhaust that administrative process before filing his complaint. The district court was required to dismiss Klug’s complaint, “even if the relief offered by that program d[id] not appear to be ‘plain, speedy, and effective.” See Alexander v. Hawk, 159 F.3d 1321, 1328 (11th Cir. 1998). Because the dismissal was without prejudice, Klug may refile his complaint. And the district court did not abuse its discretion when it denied Klug’s request for injunctive relief, which is available “only if the moving party [can] show[ ] that ... [he] has a substantial likelihood of success on the merits.” Siegel v. LePore, 234 F.3d 1163, 1176 (11th Cir. 2000).

We AFFIRM the dismissal of Klug’s complaint without prejudice.