6 Adverse Effects and Risk Reduction
Learn how common analgesic drug classes can cause harm and how individualized prescribing, monitoring, patient education, and timely emergency response can reduce those risks.
Principles of risk reduction
Every analgesic can cause harm. Reduce risk by matching the medicine to the person and pain condition, reviewing medicines and health conditions, using the lowest effective dose for the shortest appropriate time, and checking whether treatment improves pain or function without causing unacceptable effects.
Before treatment, assess the cause and severity of pain, its effect on function, relevant medical conditions, past medication problems, and use of prescription medicines, over-the-counter products, and supplements. Agree on practical goals, such as improved sleep or walking, and choose treatment to balance likely benefits and risks. Non-drug approaches and nonopioid medicines may be used alone or alongside other treatment when appropriate.
and overdose response
Common opioid effects include constipation, nausea, vomiting, itching, dizziness, drowsiness, and impaired judgment. Constipation may persist during treatment, so discuss prevention and treatment rather than waiting for it to become severe. Drowsiness and slowed breathing can progress to a life-threatening overdose.
Risk can increase with higher doses; taking more or taking doses more often than prescribed; combining with alcohol or other sedating medicines; and reduced tolerance after a break or dose reduction. Older age, sleep apnea or other breathing problems, and some liver or kidney conditions can also increase harm. Benzodiazepines, sleep medicines, muscle relaxants, gabapentin, and pregabalin may add to sedation and breathing suppression.
Reassess pain relief, daily function, and adverse effects, especially after starting or increasing a dose. Review the medication list and, when appropriate, prescription-monitoring information. Discuss overdose prevention and , particularly when risk factors are present. Do not abruptly stop long-term without a plan with the prescriber; tapering, when indicated, should be individualized.
Recognizing and responding to overdose
Warning signs include inability to wake the person, very slow or shallow breathing, blue or gray lips or fingertips, limpness, and choking or gurgling sounds. Call 911 immediately. Give if available and follow its instructions; rescue breathing or CPR may be needed. Stay with the person because can wear off before the opioid does.
and NSAID risks
The main serious risk from is liver injury from taking too much. Accidental excess can occur when someone combines several products containing , including cold remedies and prescription combinations. Liver disease and regular heavy alcohol use warrant particular caution.
Follow the product label and clinician’s instructions. The FDA adult maximum of 4,000 mg in 24 hours is an upper limit, not a target, and some products specify a lower maximum. Ask a pharmacist or clinician if unsure. After a suspected overdose, seek urgent medical advice or contact Poison Control even if the person feels well.
Ibuprofen, naproxen, and other may cause stomach upset. Serious risks include ulcers or gastrointestinal bleeding, kidney problems, fluid retention, heart attack, or stroke. Risk is greater with higher doses or longer use and may be increased by a history of ulcers or bleeding, kidney or cardiovascular disease, older age, or use of blood thinners or corticosteroids.
Do not combine multiple unless a clinician directs you to. Use the lowest effective dose for the shortest time, and ask a clinician or pharmacist whether an NSAID is appropriate if these risk factors apply. Seek urgent care for signs of bleeding, such as vomiting blood or black stools, or symptoms of a heart attack or stroke.
Adjuvant medicine effects
can help with pain even though pain relief is not their only or original use. Gabapentin and pregabalin commonly cause dizziness, sleepiness, blurred vision, or difficulty concentrating; they may also cause swelling or weight gain. Breathing problems are a concern when these medicines are combined with or other sedatives, especially in older adults or people with impaired lung function. Kidney function can affect dosing.
Some antidepressants used for pain can cause nausea, sweating, sleepiness, or other effects; specific risks depend on the medicine. Report troubling effects and ask before stopping a regularly used medicine, since some require gradual dose changes.
Monitoring and patient education
During treatment, monitor pain and function as well as side effects. Reassess after starting or changing a medicine and periodically during ongoing treatment. For longer-term or higher-risk treatment, monitoring may include medication reconciliation, relevant laboratory tests, prescription-monitoring information, or other individualized checks. Explain which changes to report and when to seek urgent help.
Teach patients to:
Take medicines only as directed. Never take extra doses to compensate for missed relief or share prescription medicines.
Check labels for duplicate ingredients, especially and , and consult a pharmacist before adding over-the-counter medicines or supplements.
Avoid alcohol with and ask before combining with any medicine that causes sleepiness. Do not drive or operate machinery until the effects are known.
Store medicines securely, away from children and visitors, and dispose of unused through an appropriate take-back or disposal option.
Know overdose warning signs, keep accessible when recommended, and make sure household members know where it is and how to use it.
Contact a clinician about severe, persistent, or unexpected effects. Seek emergency help for suspected opioid overdose, serious bleeding, chest pain, stroke symptoms, or a severe allergic reaction.