Patients with advanced cancer do not need to take morphine if they have no symptoms of pain, and they can take the drug all the time if they have symptoms of pain. Morphine tablets are a kind of opioid receptor antagonist, a kind of strong analgesic, especially suitable for pain relief treatment of middle and advanced malignant tumors. If patients with advanced cancer do not have symptoms of pain, they do not need to take the drug. If patients develop severe pain, they can take it all the time as prescribed by the doctor. It should be noted that some patients may experience adverse reactions such as nausea, vomiting, respiratory depression and drowsiness after taking Morphine Hydrochloride Tablets. It is contraindicated for patients suffering from increased internal pressure and bronchial asthma to avoid aggravation. It is contraindicated in allergic patients. The time of taking morphine for patients with advanced cancer can not be determined, patients should follow the doctor’s instructions to take medication, and should not take medication without authorization.