If your symptoms have been relieved, it may be time to see if you can do without your other medications, one at a time. Talk to your doctor about this. Once this has been done, and if your symptoms don't return, you may want to try to drop the Guaifenesin dosage. Do this gradually. According to Dr. St. Amand, some people cut back a half pill at a time and wait about three months or so before they cut back another half pill.
People are reluctant to jeopardize their hard-won health.
You have cut down too far when the symptoms return, so just resume what dosage you were on when you had no symptoms. This is your maintenance dose.