Benzo[A]phenothiazines and hydro-derivatives
 Pharmaceutical compositions containing a compound of Formula I: ##STR1## wherein X is O, S, SO or SO.sub.2 and R.sub.2, R.sub.3, R.sub.4 and R.sub.5 may be positioned anywhere on the structure, or a pharmaceutically-acceptable salt thereof and certain novel benzo[a]phenothiazines, which compositions and compounds are useful in treating allergic conditions, asthma, cardiovascular disorders, inflammation and pain and are useful as cytoprotective agents. 
Merck Frosst Canada, Inc.
A C A C C
A61K C07D A61K C07D C07F
inventional inventional inventional inventional inventional
Yvan Rejean Christiane Yves Cheuk K. Joshua
Guindon Fortin Yoakim Girard Lau Rokach