A sample labeled as mephedrone (4-MMC) did not contain 4-MMC, but rather a mixture of 2-MMC and 4-MMC.

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2-MMC (2-methylmethcathinone) is a relatively new NPS (new psychoactive substance) and a cathinone belonging to the amphetamine group. There is no reliable information available regarding its risks, toxicity, side effects, and long-term consequences. 2-MMC is often marketed online as mephedrone (4-MMC) or a 3-MMC substitute. According to user reports, the effects of 2-MMC are more comparable to those of 2-FA or amphetamine (performance-enhancing and stimulating), which is why many users have experienced a somewhat different effect than expected. Therefore, mislabeling, as in this case, increases the risk of redosing and unintentionally consuming a high dose of 2-MMC.

2-MMC is often marketed online as mephedrone (4-MMC) or a 3-MMC substitute. 2-MMC and 4-MMC also differ slightly in terms of dosage, onset of action, and duration of effect. With mixed samples, the effects can therefore be delayed ("lagging on"), which can lead to redosing before the full effect is felt. This increases the risk of overdose and greater physical strain, especially on the cardiovascular system and mental health.

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There is very little information available on the effects, side effects, and long-term consequences of these substances. Therefore, using these substances carries unknown risks. Regular use and high doses further increase the risk potential. If you still decide to use them, we strongly recommend that you adhere to the Safer Use Messages/Safer Use Tips. Due to the lack of information and the resulting difficulty in assessing the risks, we advise against regular use.

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Powders and crystalline samples are frequently mislabeled; therefore, be sure to have them tested before use!