**  SAS Code for identifying over the counter drugs  ;
**  To identify over-the-counter drugs (these can be prescribed drugs, but they are also provided over-the-counter). ; 
    if substr(atc,1,5) in ('A02AA','A02AB','A02AC','A06AA','A06AB','A11AA',
	                       'A11BA','A11EB','A11GA','A11JB','A12AA','A12AX',
	                       'B03AA','B03BB','B05XA','N01BB','N02BA','N02BE',
						   'R01AA','R05FA','R06AA','R06AE','R06AX','S01XA')
          or atc in ('B01AC06','D01AC01','D04AA10','D06AX05','G01AF02','G01AF04')
          or din in ('00716820','00701785','02231567','02185911','02185938',
		             '02230287','02230507','00278793','00449792','00449806',
                   '00510297','02194163','00192589','00228079','00265780',
					 '00303887','00461911','00513253','00513261','00513288',
                   '00551953','00564281','00716685','00728829','00728837',
					 '00756679','00781592');