The Party Drug from Hell: Hamas’ Captagon Hits Israeli Nightclubs, Leaving Users in a Nightmare
Israeli hospitals have recently encountered severe side effects in individuals who believed they had taken the party drug "Mamsi"—but had actually consumed Captagon. "This substance is more addictive and problematic, bordering on crystal meth—and that's when Mamsi itself is already a terrible drug."

Israeli hospitals have recently seen an increase in severe side effects among individuals who thought they had used "Mamsi," "Doctor," or MMC3—some of the common names for a popular party drug. However, recent findings suggest that these symptoms were actually caused by Captagon, a powerful stimulant drug that was reportedly used by Hamas terrorists during the October 7, 2023, attack.
Mamsi is a stimulant drug that has gained popularity in Israel in recent years, especially in nightclubs. It is supposed to contain the active ingredient cathinone, a synthetic derivative of the natural stimulant found in khat leaves. However, in recent weeks, users who believed they had taken Mamsi reported unexpected and unpleasant effects, such as being unable to sleep for several days, heart palpitations, and severe panic attacks.
Dr. Roy Zucker, an internal medicine specialist at Tel Aviv Medical Center (Ichilov), reported this morning (Tuesday) that toxicology tests conducted at Sheba Medical Center revealed that substances marketed as Mamsi did not contain cathinone at all. Instead, they contained a combination of amphetamine and theophylline, the key components of Captagon, which has primarily been produced in Syria.
Dr. Roy Zucker:"I estimate that I have received hundreds of inquiries regarding these side effects—I’ve stopped counting."
Captagon has been nicknamed the "poor man's cocaine" and "ISIS drug" because it has been used by members of terrorist organizations as a stimulant before carrying out attacks. The drug is known for providing bursts of energy, increased productivity, alertness, euphoria, and sometimes hallucinations. According to Dr. Zucker, it is highly addictive and bears no resemblance to the traditional form of Mamsi.
"At first, I received only a few reports, as people started noticing that the effects of the drug were completely different. After ten cases, I decided to investigate further. Today, I estimate that I have received hundreds of reports—I’ve stopped counting," says Dr. Zucker. He notes that Mamsi has become a widespread drug among both adults and teenagers. However, he warns that what is currently being sold as Mamsi is "an entirely different substance—more addictive and more dangerous, bordering on crystal meth."
Currently, the Israeli Ministry of Health is trying to trace the source of this drug, and Dr. Zucker hopes that law enforcement authorities will take action to investigate how it entered the country.
Captagon pills are produced and distributed by individuals and organizations linked to former Syrian President Bashar al-Assad and Hezbollah. According to several reports, profits from the drug trade are also being used to fund Iranian-backed militias, which have attacked U.S. forces in the Middle East in recent months.