How often am i able to renew my ritalin (methylphenidate) prescription?

It can't b renewed: It's a controlled drug & must have a new prescription written each month on a special form.

Ritalin (methylphenidate): Your doctor can write up to one month at a time.

Depends on rx: Your doc decides the dose and frequency based on your diagnosis & response to the medication.You are permitted that dose as directed and the doc may write for up to a 30 or 90 day supply based on a variety of factors & the need documented in his/her records. Those records are subject to audit.You are permitted to receive the amount/day prescribed & get more when due, not before.

Monthly: your prescriber has told you how often you can renew your prescription with their practice. In most states, the prescription can be refilled monthly or every 2-3 months depending on your insurance company's regulations.