are methylated derivatives of the xanthine family which have similar pharmacological properties. One of the most well known is caffeine, which is the active ingredient in coffee. Low doses of methylxanthines can causes low level central nervous system stimulation and arousal, which is why products with these drugs in are typically taken to wake people up.
METHYLXANTHINES: “Methylxanthines is a group of drugs which are derived from the methylated group found within the xanthine family.”