?i?u này x?y ra b?i vì k?t h?p v?i receptor mu opioid làm gi?m kh? n?ng truy?n tín Hello?u ?au t? các dây th?n kinh t?i não.Inside the United Kingdom, dihydrocodeine is often a Class B drug; but, it really is available over-the-counter in tiny amounts (fewer than 8 mg), when merged with paracetamol (see co-dydramol). Dihydrocodeine is liste