<Table> <Tr> <Th> Abbrev . </Th> <Th> Meaning </Th> <Th> Latin ( or New Latin ) origin </Th> </Tr> <Tr> <Td> a.c. </Td> <Td> before meals </Td> <Td> ante cibum </Td> </Tr> <Tr> <Td> a.d. , ad , AD </Td> <Td> right ear </Td> <Td> auris dextra </Td> </Tr> <Tr> <Td> a.m. , am , AM </Td> <Td> morning </Td> <Td> ante meridiem </Td> </Tr> <Tr> <Td> nocte </Td> <Td> every night </Td> <Td> Omne Nocte </Td> </Tr> <Tr> <Td> a.s. , as , AS </Td> <Td> left ear </Td> <Td> auris sinistra </Td> </Tr> <Tr> <Td> a.u. , au , AU </Td> <Td> both ears together or each ear </Td> <Td> aures unitas or auris uterque </Td> </Tr> <Tr> <Td> b.d.s , bds , BDS </Td> <Td> 2 times a day </Td> <Td> bis die sumendum </Td> </Tr> <Tr> <Td> b.i.d. , bid , bd </Td> <Td> twice a day / twice daily / 2 times daily </Td> <Td> bis in die </Td> </Tr> <Tr> <Td> gtt. , gtt </Td> <Td> drop ( s ) </Td> <Td> gutta ( e ) </Td> </Tr> <Tr> <Td> h. , h </Td> <Td> hour </Td> <Td> hora </Td> </Tr> <Tr> <Td> h.s. , hs </Td> <Td> at bedtime or half strength </Td> <Td> hora somni </Td> </Tr> <Tr> <Td> ii </Td> <Td> two tablets </Td> <Td> duos doses </Td> </Tr> <Tr> <Td> iii </Td> <Td> three tablets </Td> <Td> trēs doses </Td> </Tr> <Tr> <Td> n.p.o. , npo , NPO </Td> <Td> nothing by mouth / not by oral administration </Td> <Td> nil per os </Td> </Tr> <Tr> <Td> o.d. , od , OD </Td> <Td> once a day right eye </Td> <Td> omne in die oculus dexter </Td> </Tr> <Tr> <Td> o.s. , os , OS </Td> <Td> left eye </Td> <Td> oculus sinister </Td> </Tr> <Tr> <Td> o.u. , ou , OU </Td> <Td> both eyes </Td> <Td> oculus uterque </Td> </Tr> <Tr> <Td> p.c. </Td> <Td> after food </Td> <Td> post cibum </Td> </Tr> <Tr> <Td> p.m. , pm , PM </Td> <Td> afternoon or evening </Td> <Td> post meridiem </Td> </Tr> <Tr> <Td> p.o. , po , PO </Td> <Td> orally / by mouth / oral administration </Td> <Td> per os / nonstandard form per orem </Td> </Tr> <Tr> <Td> p.r. , pr , PR </Td> <Td> rectally </Td> <Td> per rectum </Td> </Tr> <Tr> <Td> p.r.n. , prn , PRN </Td> <Td> as needed , ( also Pertactin - a key antigen of ac. Pertussis vaccine ) </Td> <Td> pro re nata </Td> </Tr> <Tr> <Td> q . </Td> <Td> every </Td> <Td> quaque </Td> </Tr> <Tr> <Td> q. 1. d. , q1d </Td> <Td> every day </Td> <Td> quaque die </Td> </Tr> <Tr> <Td> q. 1. h. , q1h </Td> <Td> every hour </Td> <Td> quaque hora </Td> </Tr> <Tr> <Td> q. 2. h. , q2h </Td> <Td> every 2 hours </Td> <Td> quaque secunda hora </Td> </Tr> <Tr> <Td> q. 4. h. , q4h </Td> <Td> every 4 hours </Td> <Td> quaque quarta hora </Td> </Tr> <Tr> <Td> q. 6. h. , q6h </Td> <Td> every 6 hours </Td> <Td> quaque sexta hora </Td> </Tr> <Tr> <Td> q. 8. h. , q8h </Td> <Td> every 8 hours </Td> <Td> quaque octava hora </Td> </Tr> <Tr> <Td> q.a.m. , qAM , qam </Td> <Td> every morning </Td> <Td> quaque ante meridiem </Td> </Tr> <Tr> <Td> q.d. , qd </Td> <Td> every day / daily </Td> <Td> quaque die </Td> </Tr> <Tr> <Td> q.h.s. , qhs </Td> <Td> every night at bedtime </Td> <Td> quaque hora somni </Td> </Tr> <Tr> <Td> q.d.s , qds , QDS </Td> <Td> 4 times a day </Td> <Td> quater die sumendum </Td> </Tr> <Tr> <Td> q.i.d , qid </Td> <Td> 4 times a day </Td> <Td> quater in die </Td> </Tr> <Tr> <Td> q.h. , qh </Td> <Td> every hour , hourly </Td> <Td> quaque hora </Td> </Tr> <Tr> <Td> q.o.d. , qod </Td> <Td> every other day / alternate days </Td> <Td> quaque altera die </Td> </Tr> <Tr> <Td> q.p.m. , qPM , qpm </Td> <Td> every afternoon or evening </Td> <Td> quaque post meridiem </Td> </Tr> <Tr> <Td> q.s. , qs </Td> <Td> a sufficient quantity ( enough ) </Td> <Td> quantum sufficiat </Td> </Tr> <Tr> <Td> Rx , R , , ℞ </Td> <Td> prescription </Td> <Td> recipe </Td> </Tr> <Tr> <Td> Sig. , S . </Td> <Td> directions </Td> <Td> signa </Td> </Tr> <Tr> <Td> Stat . </Td> <Td> immediately , with no delay , now </Td> <Td> statim </Td> </Tr> <Tr> <Td> t.d.s , tds , TDS </Td> <Td> 3 times a day </Td> <Td> ter die sumendum </Td> </Tr> <Tr> <Td> t.i.d. , tid </Td> <Td> 3 times a day </Td> <Td> ter in die
<Table> <Tr> <Th> Abbrev . </Th> <Th> Meaning </Th> <Th> Latin ( or New Latin ) origin </Th> </Tr> <Tr> <Td> a.c. </Td> <Td> before meals </Td> <Td> ante cibum </Td> </Tr> <Tr> <Td> a.d. , ad , AD </Td> <Td> right ear </Td> <Td> auris dextra </Td> </Tr> <Tr> <Td> a.m. , am , AM </Td> <Td> morning </Td> <Td> ante meridiem </Td> </Tr> <Tr> <Td> nocte </Td> <Td> every night </Td> <Td> Omne Nocte </Td> </Tr> <Tr> <Td> a.s. , as , AS </Td> <Td> left ear </Td> <Td> auris sinistra </Td> </Tr> <Tr> <Td> a.u. , au , AU </Td> <Td> both ears together or each ear </Td> <Td> aures unitas or auris uterque </Td> </Tr> <Tr> <Td> b.d.s , bds , BDS </Td> <Td> 2 times a day </Td> <Td> bis die sumendum </Td> </Tr> <Tr> <Td> b.i.d. , bid , bd </Td> <Td> twice a day / twice daily / 2 times daily </Td> <Td> bis in die </Td> </Tr> <Tr> <Td> gtt. , gtt </Td> <Td> drop ( s ) </Td> <Td> gutta ( e ) </Td> </Tr> <Tr> <Td> h. , h </Td> <Td> hour </Td> <Td> hora </Td> </Tr> <Tr> <Td> h.s. , hs </Td> <Td> at bedtime or half strength </Td> <Td> hora somni </Td> </Tr> <Tr> <Td> ii </Td> <Td> two tablets </Td> <Td> duos doses </Td> </Tr> <Tr> <Td> iii </Td> <Td> three tablets </Td> <Td> trēs doses </Td> </Tr> <Tr> <Td> n.p.o. , npo , NPO </Td> <Td> nothing by mouth / not by oral administration </Td> <Td> nil per os </Td> </Tr> <Tr> <Td> o.d. , od , OD </Td> <Td> once a day right eye </Td> <Td> omne in die oculus dexter </Td> </Tr> <Tr> <Td> o.s. , os , OS </Td> <Td> left eye </Td> <Td> oculus sinister </Td> </Tr> <Tr> <Td> o.u. , ou , OU </Td> <Td> both eyes </Td> <Td> oculus uterque </Td> </Tr> <Tr> <Td> p.c. </Td> <Td> after food </Td> <Td> post cibum </Td> </Tr> <Tr> <Td> p.m. , pm , PM </Td> <Td> afternoon or evening </Td> <Td> post meridiem </Td> </Tr> <Tr> <Td> p.o. , po , PO </Td> <Td> orally / by mouth / oral administration </Td> <Td> per os / nonstandard form per orem </Td> </Tr> <Tr> <Td> p.r. , pr , PR </Td> <Td> rectally </Td> <Td> per rectum </Td> </Tr> <Tr> <Td> p.r.n. , prn , PRN </Td> <Td> as needed , ( also Pertactin - a key antigen of ac. Pertussis vaccine ) </Td> <Td> pro re nata </Td> </Tr> <Tr> <Td> q . </Td> <Td> every </Td> <Td> quaque </Td> </Tr> <Tr> <Td> q. 1. d. , q1d </Td> <Td> every day </Td> <Td> quaque die </Td> </Tr> <Tr> <Td> q. 1. h. , q1h </Td> <Td> every hour </Td> <Td> quaque hora </Td> </Tr> <Tr> <Td> q. 2. h. , q2h </Td> <Td> every 2 hours </Td> <Td> quaque secunda hora </Td> </Tr> <Tr> <Td> q. 4. h. , q4h </Td> <Td> every 4 hours </Td> <Td> quaque quarta hora </Td> </Tr> <Tr> <Td> q. 6. h. , q6h </Td> <Td> every 6 hours </Td> <Td> quaque sexta hora </Td> </Tr> <Tr> <Td> q. 8. h. , q8h </Td> <Td> every 8 hours </Td> <Td> quaque octava hora </Td> </Tr> <Tr> <Td> q.a.m. , qAM , qam </Td> <Td> every morning </Td> <Td> quaque ante meridiem </Td> </Tr> <Tr> <Td> q.d. , qd </Td> <Td> every day / daily </Td> <Td> quaque die </Td> </Tr> <Tr> <Td> q.h.s. , qhs </Td> <Td> every night at bedtime </Td> <Td> quaque hora somni </Td> </Tr> <Tr> <Td> q.d.s , qds , QDS </Td> <Td> 4 times a day </Td> <Td> quater die sumendum </Td> </Tr> <Tr> <Td> q.i.d , qid </Td> <Td> 4 times a day </Td> <Td> quater in die </Td> </Tr> <Tr> <Td> q.h. , qh </Td> <Td> every hour , hourly </Td> <Td> quaque hora </Td> </Tr> <Tr> <Td> q.o.d. , qod </Td> <Td> every other day / alternate days </Td> <Td> quaque altera die </Td> </Tr> <Tr> <Td> q.p.m. , qPM , qpm </Td> <Td> every afternoon or evening </Td> <Td> quaque post meridiem </Td> </Tr> <Tr> <Td> q.s. , qs </Td> <Td> a sufficient quantity ( enough ) </Td> <Td> quantum sufficiat </Td> </Tr> <Tr> <Td> Rx , R , , ℞ </Td> <Td> prescription </Td> <Td> recipe </Td> </Tr> <Tr> <Td> Sig. , S . </Td> <Td> directions </Td> <Td> signa </Td> </Tr> <Tr> <Td> Stat . </Td> <Td> immediately , with no delay , now </Td> <Td> statim </Td> </Tr> <Tr> <Td> t.d.s , tds , TDS </Td> <Td> 3 times a day </Td> <Td> ter die sumendum </Td> </Tr> <Tr> <Td> t.i.d. , tid </Td> <Td> 3 times a day </Td> <Td> ter in die
how do you write twice a day in medical terms
how do you write twice a day in medical terms
b.i.d. bid bd
b.i.d. bid bd