The easiest way to tackle excessive sweating is with an antiperspirant, which most people already use on a daily basis. Most antiperspirants contain aluminum salts. When you roll them onto your skin, antiperspirants form a plug that blocks perspiration.
You can buy an antiperspirant over the counter at your local supermarket or drug store, or your doctor can prescribe one for you. Over-the-counter antiperspirants may be less irritating than prescription antiperspirants. Start with an over-the-counter brand; if that doesn't work, ask your doctor about a prescription.
Many antiperspirants are sold combined with a deodorant, which won't stop you from sweating but will help control the odor from your sweat.