Are there any drugs that actually cure a condition, and not treat it?

Cancer drugs and antibiotics cover a pretty large spectrum of drugs so this question is not at all annoying for search purposes.

From a mechanism of action point of view, when a drug hits a target, it is doing something. In the case of anti-cancer and antibiotics, drugs hit the target in hopes of killing the host. As a result it works by removing the root cause of the condition.

For genetically linked diseases like heart disease, diabetes, asthma, allergies, alzheimers, kidney issues, and neurological conditions, the drug doesn't work by killing a cell, it is neutralizing a genetic cause of the disease.

So it's a bit unfair to demand a "cure" for something like that unless you're willing to surgically remove or replace an organ (which we could) or to modify your genome (which we hope).

Providing a drug that for some reason causes your genetically messed up immune system to not attack your genetically messed up pancreatic cells to "cure" type 1 diabetes is sort of an absurd and unrealistic concept.

That being said, a lot of antivirals are effective cures. Although a good number of neurological diseases are genetic, some conditions can be treated by antipsychotics and bring a patient back to a chemically balanced state which is essentially a cure. Patients who suffer from tissue damage like a stroke or wounds can use drugs to hasten the regenerative aspects of their body and come to a more complete recovery. Dermatological conditions (including acne or sunburns) come to mind. In a manner, those drugs are "cures" in that the patient no long needs to rely on them to get better.