Tetramethylserotonin (TeMS) may refer to:
5-Methoxy-2,N,N-trimethyltryptamine (5-MeO-2-TMT; 2,α,N,N-tetramethylserotonin; 2,α,N,N-TeMS) 5-Methoxy-7,N,N-trimethyltryptamine (5-MeO-7-TMT; 7,α,N,N-tetramethylserotonin; 7,α,N,N-TeMS) α,N,N,O-Tetramethylserotonin (α,N,N,O-TeMS; 5-methoxy-α,N,N-trimethyltryptamine; 5-MeO-α,N,N-TMT)
See also Substituted tryptamine Methylserotonin Dimethylserotonin Trimethylserotonin