[It all depends on the formulation].  [electronic resource] 

 -  Anasthesiologie, Intensivmedizin, Notfallmedizin, Schmerztherapie : AINS  Apr 2012 
 - 205 p.  digital 
<br/><br/> Publication Type: Editorial; Introductory Journal Article 
<br/><br/><label>ISSN: </label>1439-1074 
<br/><br/><label>Standard No.: </label>10.1055/s-0032-1311977  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Analgesics, Opioid--chemistry<br/>Anesthesia--trends<br/>Drug Compounding--trends<br/>Humans