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When this preparation is applied to the skin once a day in doses of 5 to 10 g (delivering 50 to 100 mg of testosterone), the serum testosterone concentrations usually reach the normal male range within a month and remain steady throughout 24 hours. Therefore the level would drop more than 300.
If you continue to use it, the level will reach the normal male range (around 600 for 50 mg of testosterone, around 800 for 100 mg of testosterone) within a month. There is considerable variation in the half-life of testosterone concentration as reported in the literature, ranging from 10 to 100 minutes. When AndroGel treatment is discontinued, serum testosterone concentrations return to approximately baseline concentrations within 48-72 hours after administration of the last dose.
A metered-dose pump that delivers 1.25 g of gel (containing 12.5 mg of testosterone) per pump depression. 2 pumping is 25 mg of testosterone. Are you using AndroGel?
Your level is 280 before the treatment. It is not very low. That's why your doctor asked you to use the dose.
Brand and generic products have the same effect. The shoulders and upper arms are better than the abdomen for the absorption.