The doctor prescribes Hydrocodone for treating severe to mild pain in adults. It is from the group of medications known as opioid agonists. You can buy Hydrocodone online as an immediate or extended-release form. Do not use the extended-release form of this medicine for minor pain that will last for the short-term. After consuming this medicine, you will start to feel less pain in under an hour; it reaches its peak concentration about 1.3 hours after the consumption. Taking this medicine frequently will build up a tolerance to this medicine over time.