Why does drysol only work sometimes?

Use Drysol until the sweating stops or is at your preference level. After the sweating stops/at your preference level, you are supposed to apply it less often (every other day, two days, etc.). That amount depends on the person and their preference. It does take care or underarm odor to an extent. I use cologne because other areas of the body also sweat. Also DO NOT apply any other type of deodorant to your underarms while using Drysol/Hypercare/Xerac AC it can cause major skin irritation or even reduce the effectiveness of the medicine. If it still does not work, talk with your doctor about getting a higher percentage solution!