In addition to DPIA (bis-amphetamine or di(beta-phenylisopropyl)amines), these were 4-methyl-5-phenylpyrimidine and numerous other synthesis by-products.
DPIA has a slightly stimulating effect. However, this is much less pronounced than that of amphetamine.
DPIA is considered to be moderately toxic. There is also no information on whether toxicity is increased when mixed with amphetamine. The other synthesis by-products are classified as more toxic. Some of the synthesis by-products are present in quantities that have to be described as particularly hazardous to health. Very little is known about the short- and long-term effects of the individual substances. Just as little information is available about the risks of combining the different synthesis by-products.
Avoid mixed use and always have your amphetamine chemically analysed if possible.