If-then statement: Multiple variables into one

[Dhana18]

I have a data like this 

ANTIBIOTIC
ANTIBIOTIC	Frequency
AZITHROMYCIN	1
CEFTRIAXONE/AZITHROMYCIN	3
DOXYCYCLINE	3
FLUCONAZOLE	1
METRONIDAZOLE	1
UNKNOWN	1

 I wanted to have a table like this

ANTIBIOT_NAME	Frequency
4	3
9	3
11	4
77	3

 i used this code

DATA AprilNin.MERGE_April2019_E;
SET AprilNin.MERGE_April2019_D;
IF ANTIBIOTIC =: "AZI" then ANTIBIOT_NAME = "11";
ELSE IF ANTIBIOTIC =: "CEF" then ANTIBIOT_NAME = "04";
ELSE IF ANTIBIOTIC =: "DOX" then ANTIBIOT_NAME = "09";
ELSE IF ANTIBIOTIC = "" then ANTIBIOT_NAME = "00";
ELSE ANTIBIOT_NAME="77";
RUN;

and result is this NOT what I want

ANTIBIOT_NAME	Frequency
4	3
9	3
11	1
77	3

the count of AZI (11) should be 4 but it is showing 1.

How do i code to this  CEFTRIAXONE/AZITHROMYCIN to count for both Azithromycin and Ceftriaxone?

[Jagadishkatam]

Hi  Dhana,

I responded to the same yesterday, hope you tried

could you please let me know if the below code will help

data have;
input ANTIBIOTIC &:$100.;
cards;
AZITHROMYCIN	
CEFTRIAXONE/AZITHROMYCIN	
DOXYCYCLINE	
FLUCONAZOLE	
METRONIDAZOLE	
UNKNOWN	
;

data want(rename=(newvar=ANTIBIOTIC));
set have;
do i = 1 to countw(ANTIBIOTIC,'/');
newvar=scan(ANTIBIOTIC,i,'/');
output;
end;
drop ANTIBIOTIC;
run;

data want2;
set want;
IF ANTIBIOTIC = "CEFTRIAXONE" then ANTIBIOT_NAME = "04";
ELSE IF UPCASE(ANTIBIOTIC) =: "AZ" OR UPCASE(ANTIBIOTIC) =: "ZI" then ANTIBIOT_NAME = "11";
ELSE IF UPCASE(ANTIBIOTIC) =: "CEFTRIAXONE/AZITHROMYCIN" then ANTIBIOT_NAME = "11";
ELSE IF UPCASE(ANTIBIOTIC) =: "DO" then ANTIBIOT_NAME = "09";
ELSE IF ANTIBIOTIC = "0" THEN ANTIBIOT_NAME = "00";
ELSE IF ANTIBIOTIC="" THEN ANTIBIOT_NAME="00";
ELSE ANTIBIOT_NAME="77";
run;

PROC FREQ DATA=want2;
TABLE ANTIBIOT_NAME/NOROW NOCOL NOPERCENT;
RUN;