Category Archives: research

Heavy marijuana use may harm the brain

New NIDA-funded research shows that heavy marijuana use (at least four times per week over the past six months) is linked to adverse changes in the function and structure of brain areas associated with reward, decision making, and motivation.  Heavy marijuana use can also enhance some brain circuits – possibly to compensate for reduced function in specific brain regions. This effect was more pronounced in those who started using at a young age, indicating that developing brains are particularly vulnerable to marijuana’s effects.

Illustration of a neuron cell

Although further long-term studies are needed to determine whether marijuana caused these effects, these scientific findings add to the growing literature showing that heavy marijuana use may harm the brain.

For a copy of the abstract (published online November 10), go to www.pnas.org/content/early/2014/11/05/1415297111.abstract.

Advertisements

Strong placebo response thwarts painkiller trials

Interesting article, placebo’s as effective as meds.

Drug companies have a problem: they are finding it ever harder to get painkillers through clinical trials. But this isn’t necessarily because the drugs are getting worse. An extensive analysis of trial data1 has found that responses to sham treatments have become stronger over time, making it harder to prove a drug’s advantage over placebo.

The change in response to placebo treatments for pain, discovered by researchers in Canada, holds true only for US clinical trials. “We were absolutely floored when we found out,” says Jeffrey Mogil, who directs the pain-genetics lab at McGill University in Montreal and led the analysis. Simply being in a US trial and receiving sham treatment now seems to relieve pain almost as effectively as many promising new drugs. Mogil thinks that as US trials get longer, larger and more expensive, they may be enhancing participants’ expectations of their effectiveness.

See the entire article here:  http://www.nature.com/news/strong-placebo-response-thwarts-painkiller-trials-1.18511?%3Fftcamp=crm%2Femail%2F%2Fnbe%2FFirstFTEurope%2Fproduct

MSU study finds surprises about drug use

Conducting an economic analysis of drug use is a particularly difficult endeavor, but for Michigan State University professor and economist Siddharth Chandra, it just meant taking a look at the history books.

“You can’t simply go to Wal-Mart and look at the sticker price, and people don’t want to talk to you because drugs are illegal and they think they’ll get in trouble, ” Chandra said. “Our study is the first time the subject of how populations of consumers switch between drugs is being studied with data considered reliable.”1pillst.jpg

To find reliable economic data on drug use, Chandra, also the director of the Asian Studies Center at MSU, had to look back to early 20th century India, when the region was still part of the British Empire.

“One hundred years ago these products were legal. In British India the government was actually selling these things to the public, and they kept meticulous records,” Chandra said.

In his study – the first of its kind – Chandra pored through stacks of 100-year-old ledgers, called Excise Administration Reports, kept by the governments of the various provinces of India. Interpreting these data, he found surprising results about the economics of drug use behaviors. Despite the stark differences in the effects of opium vs. cannabis on the human body, the study shows that users would switch between the two drugs when the price of one went up – in economics, a phenomenon called substitution.

“The time, place and context are different, but the phenomenon is there. You might think consumers would treat them differently,” Chandra said. “But just because the two drugs used are very different, doesn’t mean people won’t switch.”

Opium, used legally to make the pain medicine morphine and illegally to make the drug heroin, is a highly addictive and potent depressant with potentially lethal side effects. Cannabis, also known as marijuana, is a less potent drug that produces a sense of relaxation and euphoria when used, usually through smoking or ingestion. These differences only came into consideration when analyzing cannabis in its weakest form, a drug called bhang, which consumers would not substitute for the more potent opium.

“There are many policy implications for these results,” Chandra said. “Targeting a particular drug with policies and enforcement might backfire.”

Chandra pointed to the epidemic of heroin, a product of opium that is relatively inexpensive and is devastating some communities in the United States.

“Many people know someone who has been affected by heroin – it is a very dangerous drug,” Chandra said. “But prohibiting harmful drugs selectively can be ineffective. Consumers may switch.”