The strongest painkiller available for medical use is fentanyl, a synthetic opioid that is approximately 50 to 100 times more potent than morphine. An even stronger substance, carfentanil, is used exclusively by veterinarians for large animals and is not for human use.
The most powerful pain relievers are opioids, sometimes called narcotics. They include strong prescription pain relievers such as oxycodone, hydrocodone, or morphine. Opioids are sometimes used to treat moderate to severe pain.
Morphine and similar drugs (like oxycodone, fentanyl, buprenorphine) are the strongest painkillers. Some come in patch form, but all work in similar ways and are used for severe pain only.
Opioids. Opioid medications are synthetic cousins of opium and the drugs derived from opium such as heroin and morphine. These medications are typically prescribed for pain that's new, known as acute pain. Acute pain can stem from an injury, such as surgery or a broken bone.
Strong painkillers usually contain opioids or synthetic opioids. This group include drugs like morphine, fentanyl, buprenorphine, tramadol, oxycodone, OxyNorm and dihydrocodeine.
The analgesic potency ratio of oral morphine : oxycodone has been widely discussed [34, 53]. However, it has been estimated and found to range from 1:1 to 2.2:1 [54–59]. The consensus in the pain management community is that oral oxycodone is 1.5 to 2 times as potent as oral morphine regarding analgesia [60, 61].
The Food and Drug Administration (FDA) recently approved a new, non-opioid prescription pill—suzetrigine.
Dilaudid is significantly stronger—about 4-5 times more potent than Oxycodone—making it a go-to option for treating severe, chronic pain or for patients who have developed a tolerance to other opioids. It is commonly administered in hospitals for acute pain and is available in injectable and oral forms.
Tramadol and codeine are generally considered to have similar strength for pain relief, both being "weak opioids," though tramadol has two mechanisms (opioid and non-opioid) and codeine is a natural opiate, making them not perfectly interchangeable; research shows similar effectiveness, but tramadol might have different side effect profiles, with some studies showing tramadol associated with lower constipation but higher seizure risk, while codeine combinations (with acetaminophen/NSAIDs) are often stronger than either alone.
Chronic Pain Relief New Treatments – Journavx™ (suzetrigine)
In January 2025, the FDA approved Journavx (suzetrigine) – the first truly new class of pain medication in over 20 years. Instead of affecting your entire nervous system like opioids do, it specifically blocks Nav1.
It's crucial to seek professional help when chronic pain becomes too much to handle on your own. Persistent pain can lead to a decline in physical function, emotional well-being, and overall quality of life.
However, Anamorph 30 mg is a stronger dose (approximately four times the morphine equivalent dose of Endone) and could result in overdose and serious health risks if taken inadvertently.
Hydromorphone is a potent opioid medication for managing moderate-to-severe acute and severe chronic pain in patients. Hydromorphone is prescribed only when initial treatments have proven ineffective, primarily due to the drug's elevated potency, potential for abuse, and risk of overdose.
Pain relief medicines
10 ways to reduce pain
Morphine—Derived from opium, morphine was first sold in 1827 to control pain. Morphine was the original synthetically manufactured opiate and it has powerful analgesic effects. When used properly, it's improved the quality of life for many pain patients.
Lie on your right side after taking a tablet, and the active ingredient will take the shorter route into the intestine, where it's absorbed into the bloodstream and can take effect. Lie on your left side, however, and the tablet has to take the long route through the stomach. As a result, the effect is delayed.
There's no single "best" pain medication for chronic pain; it's highly individual, often requiring a combination approach with therapies like physical activity, but common starting points include paracetamol, NSAIDs (ibuprofen, diclofenac) for short-term relief, and then progressing to antidepressants (amitriptyline, duloxetine) or anticonvulsants (gabapentin, pregabalin) for nerve pain, with opioids reserved for short periods due to risks, and always under doctor supervision.
If these painkillers don't control your pain, you can try a combination. For example, paracetamol or ibuprofen with codeine or dihydrocodeine. If you're still in pain, your GP may be able to prescribe stronger painkillers or for a longer duration than what you can buy over the counter.
Tramadol is used to relieve moderate to moderately severe pain, including pain after surgery. It is also used to treat pain severe enough to require opioid treatment and when other pain medicines did not work well enough or cannot be tolerated.
To avoid red flags with your pain doctor, don't demand specific drugs (like opioids), exaggerate or downplay pain, claim "not an addict," or bring up online research as definitive; instead, be specific about pain's impact, use descriptive words, show you're open to all treatments (medication, therapy, lifestyle), and focus on functional goals like resuming activities, not just getting a prescription.