[…] confusion; therapy should not be administered within 14 days of initiating or stopping MAOIs Cases of adrenal insufficiency reported with opioid use, more often following greater than one month of use; symptoms may include nausea, vomiting, anorexia, fatigue [reference.medscape.com]

If you have nausea, it may help to take this drug with food. Ask your doctor or pharmacist about other ways to decrease nausea (such as lying down for 1 to 2 hours with as little head movement as possible). If nausea persists, see your doctor. [webmd.com]

Common opioid side effects are constipation, nausea, sedation, dizziness, vomiting, headache, dry mouth, sweating, mood changes, flushing, loss of appetite, and weakness. [drugfree.org]

You can also experience nausea or constipation. The opiate effect also slows down breathing; in the worst case, that can prevent enough oxygen from reaching your brain. The consequences are dangerous, ranging from brain damage to death. [sheerrecovery.com]

The most common side effects of these drugs include: nausea vomiting dizziness drowsiness insomnia constipation itchiness dry mouth weakness headache changes in mood or behavior Severe side effects of these drugs are less common. [healthline.com]

[…] drugs, include: Feelings of euphoria Feelings of relaxation Marked reductions in the subjective experience of pain Marked reductions in anxiety Increased sedation Side effects that will occur in some individuals include: Gastrointestinal issues, such as nausea [americanaddictioncenters.org]

Tell your doctor right away if you have any serious side effects, including: interrupted breathing during sleep (sleep apnea), mental/mood changes (such as agitation, confusion, hallucinations), severe stomach/abdominal pain, difficulty urinating, signs [webmd.com]

A week later, Judge Stephens ordered one more document withdrawn from public view: His Nov. 5 ruling that there was enough evidence against Purdue to warrant a trial. The Times reviewed a copy of the ruling. [latimes.com]