To provide further for the availability of indigent health care, the operation of the Medicaid Program and the maintenance and expansion of medical services thereunder, there is hereby levied and shall be collected as provided in this article a privilege tax on the business activities of every provider of pharmaceutical services to the citizens of Alabama, except for a pharmacy, or portion thereof, serving hospital inpatients or pharmacies owned or operated by the State of Alabama or an agency thereof. The privilege tax imposed by this article is in addition to all other taxes of any kind now imposed by law, and shall be at the rate of 10 cents for each prescription filled or refilled for a citizen of Alabama.