The character limits are as follows:

In Medications:
Dosage: 10
Comments: 3840

In Allergies:
Signs of a Reaction: 3840
What if there is a minor reaction?: 3840

In Visits:
Assessment: 3840
Notes: 3840

In Notes:
Description: 3840
Comments: 3840

In History
Description: 3840
Comments: 3840