5F-AMB, also known as 5F-AMB-PINACA, is a synthetic cannabinoid that has been sold as a designer drug. It belongs to the AMB series of compounds, which are potent agonists of the cannabinoid receptors. These types of chemicals are often used to mimic the effects of THC (delta-9-tetrahydrocannabinol), the active ingredient in cannabis, but they can be much more potent and pose significant health risks.

Like other synthetic cannabinoids, 5F-AMB can have unpredictable effects on the human body and mind. These may include euphoria, relaxation, altered perception of time, and heightened sensory experiences. However, there are also numerous reports of adverse effects such as anxiety, paranoia, hallucinations, and even more severe reactions including seizures and cardiovascular issues.

The legality of 5F-AMB varies from country to country, but it is often controlled due to its potential for abuse and harm. Its use is strongly discouraged due to the risks involved and the lack of regulation, which means users cannot be sure of the purity or dosage they are consuming.