The names indicate what kind of drug it is (to doctors and pharmacists who know the naming rules).
-mab is for monoclonal antibody drugs
-caine for local anesthetics eg benzocaine, lanacaine
-etine is for SSRIs (type of antidepressants) eg fluoxetine
-afil for erectile dysfunction meds eg sildenafil (Viagra)
-feb and -fene for estrogen response modifiers eg tamoxifen
etc. etc.
You can search “drug naming rules” or “pharmacological suffixes” to get big lists of these and what they all mean.
https://accesspharmacy.mhmedical.com/content.aspx?bookid=1549§ionid=93411751
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