A client presents with non-healing ulcers, abscesses, brittle fingernails, and bruxism. What drug classification is most likely abused?

The presence of non-healing ulcers, abscesses, brittle fingernails, and bruxism suggests the possibility of stimulant abuse, particularly with amphetamines. Stimulants can lead to significant physical health issues, including skin ulcers and abscesses as a result of frequent intravenous use. Additionally, they often cause users to grind their teeth (bruxism) due to increased energy and agitation.

The brittle fingernails could also relate to nutritional deficiencies that sometimes accompany stimulant abuse, as individuals may neglect proper self-care and nutrition while under the influence of these drugs. Overall, the symptoms presented align closely with the effects and consequences of amphetamine use, making this classification the most likely one associated with the client's condition.