The damage that these drugs can do, obviates a cochlear implant solution.
The cochlear implant requires healthy [enough] nerves.
The drugs are anti-healthy nerves.
Implants are not performed for people whose nerves fail to pass various, elaborate tests over a period of time.
But of course, a person of extraordinary wealth might prevail upon surgeons and audio specialists to perform the surgery anyway and take their chances.
Yet the knowledge that certain drugs can affect the nerves to the ears, would be on the checkoff list of things to avoid ... and for some time ... in order to observe any hearing recovery.
Of course a drug addict might deny, deny, deny ...
Then there is much testing that would illuminate the drugs.
BTW, ordinary aspirin can dull your nerves --- several drugs can --- it depends upon your nervous systems' vulnerabilities.
In general, however, nerves so damaged to render an ear technically "disabled," are not nerves good enough for a cochlear implant.