Crabtree asserts that the court of appeals erred in dismissing her complaint. Crabtree’s complaint included claims for injunctive and mandamus relief.
Injunctive Relief
In her complaint, Crabtree contended that the court of appeals could “restrain the Franklin County Health Board from withholding fully drafted regulations that would benefit the entire Columbus area.” The court of appeals concluded that “[t]o the extent that relator’s request for a writ of mandamus asks for injunctive relief, this court must dismiss appellant’s action for want of jurisdiction.” Neither this court nor a court of appeals has original jurisdiction in prohibitory injunction. State ex rel. Governor v. Taft (1994), 71 Ohio St.3d 1, 3, 640 N.E.2d 1136, 1137-1138; State ex rel. Pressley v. Indus. Comm. (1967), 11 Ohio St.2d 141, 40 O.O.2d 141, 228 N.E.2d 631, paragraph four of the syllabus. Therefore, the court of appeals properly dismissed that portion of Crabtree’s complaint which requested injunctive relief.
Mandamus
The court of appeals dismissed Crabtree’s mandamus claim pursuant to Civ.R. 12(B)(6). In order to dismiss a complaint under Civ.R. 12(B)(6) for failure to state a claim upon which relief can be granted, it must appear beyond doubt from the complaint that the relator can prove no set of facts warranting relief after all factual allegations are presumed true and all reasonable inferences are made in the relator’s favor. State ex rel. Neff v. Corrigan (1996), 75 Ohio St.3d 12, 14, 661 N.E.2d 170, 173.
Crabtree contends that she is entitled to a writ of mandamus to compel the board to enact the tabled tattoo regulation. Public duties having their basis in law may be compelled by a writ of mandamus. State ex rel. Levin v. Schremp (1995), 73 Ohio St.3d 733, 735, 654 N.E.2d 1258, 1260. R.C. 3709.21 provides that “[t]he board of health of a general health district may make such orders and *249regulations as are necessary for its own government, for the public health, the prevention or restriction of disease, and the prevention, abatement, or suppression of nuisances.” As conceded by Crabtree, R.C. 3709.21 vests the board with discretion to issue regulations concerning the public health.
“The extraordinary writ of mandamus cannot be used to control the exercise of administrative or legislative discretion.” State ex rel. Dublin v. Delaware Cty. Bd. of Commrs. (1991), 62 Ohio St.3d 55, 60, 577 N.E.2d 1088, 1093. “Absent an abuse of discretion, mandamus cannot compel a public body or official to act in a certain way on a discretionary matter.” State ex rel. Veterans Serv. Office v. Pickaway Cty. Bd. of Commrs. (1991), 61 Ohio St.3d 461, 463, 575 N.E.2d 206, 207. The term “abuse of discretion” implies an attitude that is unreasonable, arbitrary or unconscionable. State ex rel. Bitter v. Missig (1995), 72 Ohio St.3d 249, 253, 648 N.E.2d 1355, 1358.
Crabtree asserts that her complaint alleged an abuse of discretion by the board sufficient to withstand a motion for dismissal. Crabtree claims that the board’s failure to enact the proposed tattooing regulation endangered the public health. However, the materials incorporated in Crabtree’s complaint1 indicate that some states have declined to enact tattooing regulations due, in part, to the minimal public health risk associated with tattooing and the possibility that regulating the practice would drive it underground. In addition, an article attached to Crab-tree’s complaint noted that an epidemiologist employed by the Georgia Office of Infectious Disease stated that he doubted that regulating tattooing would be beneficial, since it would likely target those artists who already sterilize their equipment. Finally, the attached materials also indicate that there have been no documented cases linking unregulated tattooing to transmission of the AIDS virus. Contrary to Crabtree’s contentions on appeal, the possibility that the board may have decided to table the regulation because it did not want to legitimate tattooing does not indicate bad faith. Therefore, based on the evidence contained in articles incorporated in Crabtree’s own complaint, the board did not abuse its discretion in not adopting the proposed tattooing regulation.
Furthermore, Crabtree’s complaint indicates that she instituted the action because the court of appeals denied her motion to intervene in a similar case. A writ of mandamus will not be issued when there is a plain and adequate remedy in the ordinary course of the law. R.C. 2731.05. In order for an alternative remedy to constitute an adequate remedy at law, it must be complete, beneficial, and speedy. State ex rel. Huntington Ins. Agency, Inc. v. Duryee (1995), 73 Ohio *250St.3d 530, 536, 653 N.E.2d 349, 355. Crabtree alleged in her complaint that she brought her mandamus action rather than an appeal of the order denying intervention after a final judgment by the court of appeals in the other case because an appeal “would prove quite dilatory.” However, “ ‘[w]here a constitutional process of appeal has been legislatively provided, the sole fact that pursuing such process would encompass more delay and inconvenience than seeking a writ of mandamus is insufficient to prevent the process from constituting a plain and adequate remedy in the ordinary course of law.’ ” State ex rel. Newton v. Court of Claims (1995), 73 Ohio St.3d 553, 557, 653 N.E.2d 366, 370, quoting State ex rel. Willis v. Sheboy (1983), 6 Ohio St.3d 167, 6 OBR 225, 451 N.E.2d 1200, paragraph one of the syllabus; see, also, State ex rel. Gillivan v. Bd. of Tax Appeals (1994), 70 Ohio St.3d 196, 200, 638 N.E.2d 74, 77 (argument that appeal is inadequate because it is too time-consuming and expensive to pursue is generally insufficient to justify writ of mandamus).
For the foregoing reasons, after construing the allegations of Crabtree’s complaint and all reasonable inferences therefrom most strongly in her favor, it appears beyond doubt that she cannot prove a set of facts entitling her to the requested extraordinary relief in mandamus. Accordingly, we affirm the judgment of the court of appeals dismissing her complaint.
Judgment affirmed.
Moyer, C.J., Douglas, Resnick, F.E. Sweeney, Pfeifer, Cook and Stratton, JJ., concur.. Material incorporated in a complaint may be considered part of the complaint for purposes of determining a Civ.R. 12(B)(6) motion to dismiss. State ex rel. Edwards v. Toledo City School Dist. Bd. of Edn. (1995), 72 Ohio St.3d 106, 109, 647 N.E.2d 799, 802: State ex rel. Midwest Pride IV, Inc. v. Pontious (1996), 75 Ohio St.3d 565, 569, 664 N.E.2d 931, 935, fn. 1; Civ.R. 10(C).