Actually, with the current laws, there is no limit on the amount of medication a patient can have because of the court case, People vs. Patrick K. Kelly:
(got this from NORML's website)
The People v. Patrick K. Kelly in the Supreme Court of California
[excerpt] “Whether or not a person entitled to register under the [2004 state law] elects to do so, that individual, so long as he or she meets the definition of a patient or primary caregiver under the CUA (Compassionate Use Act of 1996), retains all the rights afforded by the CUA.
Thus, such a person may assert, as a defense in court, that he or she possessed or cultivated an amount of marijuana reasonably related to meet his or her current medical needs … without reference to the specific quantitative limitations specified by the [2004 state law.]“
In short, the Court affirmed that
the state’s guidelines in no way override the sweeping legal protections provided under Proposition 215, the Compassionate Use Act of 1996. As long as a patient possess quantities of cannabis that are “related to meet his or her current medical needs,” then they are legally protected under state law — regardless of whether or not these quantities are in accordance with state-imposed or locally-imposed guidelines.