Substances
Matrix
Comments
Medazepam
Menthol
6-Mercaptopurine
Metformin
Methamphetamine
Methoin
Methotrexate
5- and 8-Methoxypsoralen
Metoprolol (enantiomers)
Metronidazole
Midazolam and metabolites
Montelukast
human plasma
human plasma, urine
human plasma, serum
human plasma, rat plasma, human urine
human plasma
serum
plasma, urine
human plasma
human plasma, serum
plasma
human plasma
human plasma, human urine, dog plasma, dog urine
human plasma
human plasma
Midodrine and metabolites (enantiomers)
Minocycline
Mitomycin C
Molsidomine
human / dog serum
human plasma, serum