Any additional first aid supplies are based on the specific workplace and work processes; not the workers themselves and any confidential underlying medical issues they may have.
If a worker voluntary discloses a medical condition requiring specific medications, it is the decision of that worker to disclose, and provide, the medication they may require. They should also explain the administration instructions to the first aid attendant.
Medical information disclosed to the First Aid attendant is voluntary, and it must remain private and confidential.