Most pain medications are absorbed very quickly after oral administration and usually achieve pain relief within an hour or so after oral administration, but it is not recommended to take a lot of pain medications regularly to avoid dependence on them. Nowadays, many people take painkillers on their own to relieve pain when they are in pain, but painkillers need to be taken under the guidance of a doctor or according to the instructions of the drug. Patients with digestive system diseases or allergies to drugs must be prohibited from taking them. Once nausea, vomiting, diarrhea, abdominal pain and other drug reactions occur after taking painkillers, they should go to the hospital for treatment in time, and in serious cases, stomach lavage may be required.