Use of dipyridamole in the last 24 hours or use of xanthines (aminophylline or caffeine) in the last 12 hours. Adenosine Dose. (See chart on next page): Adenosine is given as a continuous infusion at a rate of 140 ug/kg/min over a 4 minute period. Maximum dose 60 mg. Radiotracer infusion between 2 minutes after the start of the adenosine infusion. Adenosine dose is given under the direction of the stress test physician.