st: Working with complex strings

["Dudekula, Anwar" <dudekulaan@upmc.edu>]

Dear Stata List Reader, 

I am reposting the message as my previous one got listed somehow under a different thread instead of being a new question.I apologise for the inconvenience

I am working with deidentified hospitaldatabase with patient names(as string variable) and medications (as string variable)as follows 

Patients_name           medication
------------------------------------
Patient-1               metoprolol 100 mg qday
Patient-1               metoprolol tatrate 150mg bid
Patient-1               atenelol 150 mg qday 
Patient-2               hctz 25 mg qday 
Patient-2               PEG interferon 
Patient-3               cimzia 50 mg qday 

Question: I am interested in name of medication only , not their dosages.Is it possible to split  the medication string  after the name  i.e., 

1) split  metoprolol tatrate 150mg bid into  metoprolol tatrate  &  150mg bid
2) split  metoprolol 100 mg qday into   metoprolol   &   100 mg qday

Thank you, 
Yours Sincerely,
Anwar

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