Final answer:
The disadvantage of medication administration through intraocular disk is the risk of introducing infection and the occurrence of serious systemic effects.
Step-by-step explanation:
A disadvantage of medication administration through intraocular disk is the risk of introducing infection. When a drug is administered through this route, there is a chance that bacteria or other pathogens may enter the eye and lead to an infection.
Additionally, medication administration through intraocular disk may lead to serious systemic effects. This means that the drug may have effects on other parts of the body beyond the eye, potentially causing unwanted side effects or complications.
Although expense and slow absorption could be potential disadvantages of medication administration through other routes, such as intravenous or intramuscular injection, they are not specifically associated with intraocular disk administration.