1: Introduction - Mr. Liu, a 60-year-old man, has been experiencing occasional headaches for about 2 years. - He has been taking analgesics to relieve the pain, increasing the dosage over time. - Recently, he started feeling weak and experiencing pain in the lower back and abdomen.
2: The Reason for the Decreased Availability of Analgesics - Analgesics, such as "Qu Tong Pian," are inexpensive and effective painkillers.
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