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Family Physician
Family Physician, Doctor
Category: Medical
Satisfied Customers: 2418
Experience:  GP with over 27 years experience including emergency medicine
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What are possible antagonists and agonists when taken together

Customer Question

What are possible antagonists and agonists when taken together with Concerta XL ?
What are possible antagonists and agonists when taken together with Ritalin IR ?
I am on Concerta XL 54 mg/day taken in the morning. Some days I experience an increased effect and focus when taking the medication. I am trying to figure out the underlying reason behind this. This is when sleep patterns and food are consistent.
moreover, how long does it take to start getting an effect from Concerta XL ? Is it recommended to take before having breakfast?
Submitted: 2 years ago.
Category: Medical
Expert:  Dr. Chip replied 2 years ago.
Hi--can you explain your first two statements please?
Customer: replied 2 years ago.

antagonist: reduces effect

agonist: promotes the effect

Expert:  Dr. Chip replied 2 years ago.
OK--so you're asking first of all why the Concerta XL seems to work differently from day to day? And how long have you been on it?
Customer: replied 2 years ago.

yes exactly, I have been on it for 1 month

Expert:  Dr. Chip replied 2 years ago.
OK--so is this a major difference on certain days?