26838
These compounds , structurally similar to methamphetamine ( METH ) and 3 , 4 - methylendioxymethamphetamine ( MDMA ) , cause tachycardia , hallucinations and psychosis .
 methamphetamine, METH, 3 , 4 - methylendioxymethamphetamine, MDMA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 methamphetamine, METH, 3 , 4 - methylendioxymethamphetamine, MDMA