Dicloxacillin (Diclocil) an antibiotic in the Penicillin family. Dicloxacillin is a narrow spectrum antibiotic that is used primarily against Gram-positive bacteria that produce an enzyme called beta lactamase. Dicloxacillin is used to treat a variety of skin infections that are caused by Staphylococcus bacteria.

Dicloxacillin is rarely used to treat acne. For the treatment of acne, other Penicillin family antibiotics (eg. Amoxicillin, Ampicillin) are more common. Laboratory research indicates that the acne-causing P. acnes bacterium is very sensitive to Penicillins, including Dicloxacillin. Therefore, this medication may have some utility as an acne treatment. Dicloxacillin is widely available in combination with Amoxicillin or Ampicillin.