Caffeine is a stimulant which results in increased alertness and decreased drowsiness and fatigue when taken in low doses (50-200 mg). Caffeine also has some weak appetite-suppressant properties. It effects circulatory function and has unpredictable effect on blood pressure. Because overweight people run a higher risk of hypertension, caution should be exercised when excess caffeine is taken in combination with Phentermine and its derivatives. Phentermine may cause sleeplessness. Caffeine exacerbates this sleeplessness and the combination may result in over stimulation.
Over the counter and prescription pain killers, decongestants and diet pills can add to your caffeine intake. (Excedrin, 65 mg; Midol, 32 mg; Anacin, 32 mg; Darvon Compound, 32 mg; and Fiorinal, 32 mg.) Instead of healing the cold, caffeine slows down the elimination of mucus and destroys vitamin C. The caffeine content of diet pills is often not clearly stated on the labels.