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 The leading web portal for pharmacy resources, news, education and careers November 23, 2017
Pharmacy Choice - Pharmaceutical News - Overcoming opioids Overcoming Opioids: The quest for less addictive drugs Drug companies race to find less-addictive alternatives to stem epidemic - November 23, 2017

Pharmacy News Article

 4/18/17 - Overcoming opioids Overcoming Opioids: The quest for less addictive drugs Drug companies race to find less-addictive alternatives to stem epidemic

Tummy tucks really hurt. Doctors carve from hip to hip, slicing off skin, tightening muscles, tugging at innards. Patients often need strong painkillers for days or even weeks, but Mary Hernandez went home on just over-the-counter ibuprofen.

The reason may be the yellowish goo smeared on her 18-inch wound as she lay on the operating table. The Houston woman was helping test a novel medicine aimed at avoiding opioids, potent pain relievers fueling an epidemic of overuse and addiction.

Vicodin, OxyContin and similar drugs are widely used for bad backs, severe arthritis, damaged nerves and other woes. They work powerfully in brain areas that control pleasure and pain, but the body adapts to them quickly, so people need higher and higher doses to get relief.

This growing dependence on opioids has mushroomed into a national health crisis, ripping apart communities and straining police and health departments. Every day, an overdose of prescription opioids or heroin kills 91 people, and legions more are brought back from the brink of death. With some 2 million Americans hooked on these pills, evidence is growing that they're not as good a choice for treating chronic pain as once thought.

Drug companies are working on alternatives, but have had little success.

Twenty or so years ago, they invested heavily and "failed miserably," said Dr. Nora Volkow, director of the National Institute on Drug Abuse.

Pain is a pain to research. Some people bear more than others, and success can't be measured as objectively as it can be with medicines that shrink a tumor or clear an infection. Some new pain drugs that worked well were doomed by side effects - Vioxx, for instance, helped arthritis but hurt hearts.

Some fresh approaches are giving hope:

"Bespoke" drugs, as Volkow calls them. These target specific pathways and types of pain rather than acting broadly in the brain. One is Enbrel, which treats a key feature of rheumatoid arthritis and, in the process, eases pain.Drugs to prevent the need for opioids. One that Hernandez was helping test numbs a wound for a few days and curbs inflammation. If people don't have big pain after surgery, their nerves don't go on high alert and there's less chance of developing chronic pain that might require opioids.Funky new sources for medicines. In testing: Drugs from silk, hot chili peppers and the venom of snakes, snails and other critters.Novel uses for existing drugs. Some seizure and depression medicines, for example, can help some types of pain.

The biggest need, however, is for completely new medicines that can be used by lots of people for lots of problems. These also pose the most risk - for companies and patients alike.

One drug's bumpy road

In the early 2000s, a small biotech company had a big idea: blocking nerve growth factor, a protein made in response to pain. The company's drug, now called tanezumab, works on outlying nerves, helping to keep pain signals from muscles, skin and organs from reaching the spinal cord and brain - good for treating arthritis and bad backs.

Pfizer Inc. bought the firm in 2006 and expanded testing. But in 2010, some people on tanezumab and similar drugs being tested by rivals needed joint replacements. Besides dulling pain, nerve growth factor may affect joint repair and regeneration, so a possible safety issue needed full investigation in a medicine that would be the first of its type ever sold, said one independent expert, Dr. Jianguo Cheng, a Cleveland Clinic pain specialist and science chief for the American Academy of Pain Medicine.

Regulators put some of the studies on hold. Suddenly, some people who had been doing well on tanezumab lost access to it. Phyllis Leis in Waterfall, a small town in south-central Pennsylvania, was one.

"I was so angry," she said. "That was like a miracle drug. It really was. Unless you have arthritis in your knees and have trouble walking, you'll never understand how much relief and what a godsend it was."

Her doctor, Alan Kivitz of Altoona Center for Clinical Research, has helped run hundreds of pain studies and consults for Pfizer and many other companies. "You rarely get people to feel that good" as many of them did on the nerve growth factor drugs, he said.

A drug with that much early promise is unusual, said Ken Verburg, who has led Pfizer's pain research for several decades.

An independent review ultimately tied just a few serious joint problems to tanezumab and the suspension on testing was lifted in August 2012. But a new issue - nervous system effects in some animal studies - prompted a second hold later that year, and that wasn't lifted until 2015.

Now, Eli Lilly & Co. has joined Pfizer in testing tanezumab in late-stage studies with 7,000 patients. Results are expected late next year - about 17 years after the drug's conception.

On the horizon

Many companies have their eyes on sodium channel blockers, which affect how nerves talk to each other and thus might help various types of pain. Others are testing cell therapies for nerve pain. Stem cells can modulate immune responses and inflammation, and may "overcome a raft of problems," said Cheng of the pain medicine academy.

And then there's marijuana. A cannabis extract is sold as a mouth spray in Britain for nerve pain and other problems from multiple sclerosis. But cannabinoid research in the U.S. has been hampered by marijuana's legal status. A special license is needed and most researchers don't even try to obtain one, said Susan Ingram, a neurosurgery scientist at Oregon Health & Science University.



© © Copyright 2017, Winston-Salem Journal, Winston-Salem, NC

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