In this task, you will be given sentences in which your task is to recognize the name of the drug or medicine. Drugs are substances that change a person's mental or physical state. They can affect how your brain works, how you feel and behave, your understanding, and your senses. Although there might be several correct answers, you need to write one of them.

Let me give you an example: Acute pain was observed after taking MTX
The answer to this example can be: MTX
Here is why: MTX is a medicine which has been mentioned here, and hence the name should be tagged.

OK. solve this:
CONCLUSIONS: Cicatrization in the substantia propria of the conjunctiva by excessive lymphocytic infiltration after topically administered antiglaucoma drugs including dipivefrin is a possible mechanism of action for entropion.
Answer:
dipivefrin