Pain and Comfort Medications

Acetaminophen is an analgesic, meaning a pain reliever, and an antipyretic, meaning it reduces fever.

It works primarily in the central nervous system, which includes the brain and spinal cord, by altering how pain and temperature signals are processed. Unlike nonsteroidal anti inflammatory drugs, or NSAIDs, it does not significantly reduce inflammation in injured tissues.

It is commonly used for mild to moderate pain and fever and is often combined with other medications that act through different mechanisms.

Ketorolac is a nonsteroidal anti inflammatory drug, or NSAID. NSAIDs block enzymes called cyclooxygenase, abbreviated COX. These enzymes produce prostaglandins, chemicals that promote inflammation, swelling, and pain.

By reducing prostaglandin production, ketorolac decreases both inflammation and pain intensity. It is particularly effective in conditions such as kidney stones or musculoskeletal injury where inflammation drives symptoms.

It treats the inflammatory source of pain, not only the perception of pain.

Lorazepam is a benzodiazepine used for anxiety, agitation, and procedural sedation. Sedation means reducing awareness and calming excessive nervous system activity.

It enhances the effect of GABA, which stands for gamma aminobutyric acid. GABA is the brain’s primary inhibitory neurotransmitter, meaning it slows excessive electrical signaling.

By increasing inhibitory signaling, lorazepam reduces anxiety, controls agitation, and can assist with medical procedures when calming is necessary.

Morphine is an opioid analgesic used for moderate to severe pain. Opioids bind to opioid receptors in the brain and spinal cord, decreasing transmission of pain signals.

Pain transmission refers to the movement of pain signals from injured tissue through nerves to the brain. Morphine does not correct the underlying injury. It reduces how intensely those signals are interpreted.

Because opioids can suppress the respiratory center, which controls breathing, patients receiving morphine are monitored carefully.

Ondansetron is an antiemetic, meaning it prevents nausea and vomiting.

It blocks serotonin receptors called 5 HT3 receptors. Serotonin is a neurotransmitter, a chemical messenger used by nerve cells. Activation of 5 HT3 receptors can trigger the vomiting reflex in the brain and gut.

By blocking this pathway, ondansetron reduces nausea and helps prevent dehydration and electrolyte imbalance.