Investigational Med for Tourette Syndrome Promising

No Weight Gain

Suicidal ideation was reported during the dosing period in eight patients in the placebo group and none in the ecopipam group. One patient treated with ecopipam had multiple depressive episodes and dropped out of the study on day 79. Ecopipam was discontinued in another patient because of anxiety. 

Notably, there was more weight gain in the placebo group than in the ecopipam group (2.4 kg vs 1.8 kg) by 12 weeks. No shifts from baseline were seen in blood glucose, A1c, total cholesterol, or triglycerides in either group. 

The lack of weight gain with ecopipam is important, Dr. Gilbert stressed. “Medicines that block D2 so often cause weight gain, and a lot of our patients, unfortunately, can be heavier already,” he explained. “We don’t want to make that worse or put them at a long-term risk of type 2 diabetes.”  

For patients with more severe disease, we really “do need something else besides D2-blockers in our tool kit,” he added. 

Commenting on the study, Tanya Simuni, MD, co-moderator of the session and director of the Parkinson’s Disease and Movement Disorders Center, Northwestern Feinberg School of Medicine, Chicago, said the aim of assessing D1-directed medications is to reduce the negative impact of traditional antipsychotics with a theoretical benefit on hyperkinetic movement.

But the most important thing that they’ve shown is that “there was no negative effect, no liability for the nonmotor manifestations of Tourette’s. That is important because Tourette’s is not a pure motor syndrome, and psychiatric manifestations in a lot of cases are associated with more disease-related quality of life impairment compared to the motor manifestations,” said Dr. Simuni.

That said, she noted, the “ideal drug would be the one that would have benefit for both motor and nonmotor domains.” 
 

Multiple Agents in the Pipeline 

“The neuropharmacology of Tourette syndrome has long remained stagnant, and most existing treatments often fail to balance efficacy with tolerability, underscoring the urgent need for newer therapeutics,” Christos Ganos, MD, professor of neurology, University of Toronto, said in a press release.

He noted that three studies have been published on ecopipam since 2014: an 8-week, open-label trial in adults with Tourette syndrome, a 4-week, placebo-controlled crossover trial in 38 children with Tourette syndrome, and the 12-week D1AMOND trial.

“These studies demonstrated clinically meaningful reductions in tics, without relevant safety concerns or changes in Tourette syndrome-typical neuropsychiatric measures, as also shown by the abstract highlighted here,” Dr. Ganos said. 

“This emerging body of research provides a solid foundation for introducing ecopipam as a novel pharmacological agent to treat tics and may motivate further work, both on the pathophysiology and pharmacotherapy of tic disorders and their associations.”

A single-arm, phase 3 trial is currently underway at 58 centers in North America and Europe investigating the long-term safety and tolerability of ecopipam over 24 months in 150 children, adolescents, and adults with Tourette syndrome. The study is expected to be completed in 2027.

Several other new medications are also under investigation including the vesicular monoamine transporter (VMAT2) inhibitors tetrabenazine, deutetrabenazine, and valbenazine; the PEDE10A inhibitor gemlapodect; the allopregnanolone antagonist sepranolone; and SCI-110, which combines dronabinol (the synthetic form of tetrahydrocannabinol) and the endocannabinoid palmitoylethanolamide.

The study was funded by Emalex Biosciences. Dr. Gilbert’s institution received research support from Emalex Biosciences and PTC Therapeutics. Dr. Gilbert has received publishing royalties from a healthcare-related publication; compensation for serving as a medical expert with Teladoc; Advanced Medical; and the National Vaccine Injury Compensation Program, US Department of Health and Human Services. Simuni reports no relevant conflicts of interest. Dr. Ganos has received honoraria for educational activities from the Movement Disorder Society and academic research support from VolkswagenStiftung. 
 

A version of this article first appeared on Medscape.com.