The Drug Prescription
Ma. Minda Luz M. Manuguid, M.D.
The Drug Order / Prescription
Contents of a Prescription:
name of medication (generic)
amount of medication to be given ...
John dela Cruz 36y/o M/M
1135 Quezon Drive, Dau
08 Jan 2010
Rx
Hydroxyzine 25 mg tab #20
(ITERAX)
Sig: 2 tabs q d, h.s.
ml...
frequency abbreviation explanation
every day q. d. q. – Lat. – quisque = every
d. – Lat – diem = day
every other day q. o....
frequency abbreviatio
n
explanation
every
morning
q. a. m. q. – every
a. – ante = before
m. – meridiem = noon
at bedtime h...
frequency abbreviation explanation
as
necessary
s. o. s. si opus sit = if it is
necessary
as needed p. r. n. pro re nata =...
abbreviatio
n
explanation
p.o. per orem = by mouth
iv intravenous
im intramuscular
subQ; sq subcutaneous
mg milligram
mcg ...
Drug Dosage
parenteral meds: units of measurement:
units/hr.; mg./hr.; mg./min.; mcg/min.;
mcg/kg/min
formula : dose = r...
Dosage calculations
Rate – always in ml./hr.
Ratio & Proportion – equations
containing ratios of equal value
separated b...
Calculations
Intravenous calculations – drop factor
 macrodrop – factor of 10, 15, or 20 drops per ml
 microdrip – 60 g...
Calculations
 600 ml to be infused within 3 hrs.
 10 gtts/ ml : 600ml = 6000 gtts; 3 hrs = 180 min
• 6000 gtts / 180 min...
Pediatric Calculations
Based on body surface area
 BSA is determined from a normogram
 Formula: child’s BSA /1.7 sq. m....
Pediatric calculations
 e.g. Amoxycillin : 30-50 mg./kg. body wt
prep: gtts 100mg/ml
patient : 6 month old baby boy weigh...
Thank You !
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Pharma drugprescription

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Pharma drugprescription

  1. 1. The Drug Prescription Ma. Minda Luz M. Manuguid, M.D.
  2. 2. The Drug Order / Prescription Contents of a Prescription: name of medication (generic) amount of medication to be given (dose) route of administration frequency of administration other information: prescribing physician’s name, signature, license no., PTR no., S2 no. if applicable; date; patient’s name, age, etc.,
  3. 3. John dela Cruz 36y/o M/M 1135 Quezon Drive, Dau 08 Jan 2010 Rx Hydroxyzine 25 mg tab #20 (ITERAX) Sig: 2 tabs q d, h.s. mlmanuguid m.d. lic no. 58244 PTR # 0687226
  4. 4. frequency abbreviation explanation every day q. d. q. – Lat. – quisque = every d. – Lat – diem = day every other day q. o. d. o - other every hour every 2 hrs every 3 hrs. etc. q. h. q. 2h. q. 3h. etc. h – hora = hour 2x a day 3x a day 4x a day b. i. d. t. i. d. q. i. d. b. – bi = twice t. – tri = thrice q. – quad = four times as much as required q. s. q. – quantity s. - sufficient
  5. 5. frequency abbreviatio n explanation every morning q. a. m. q. – every a. – ante = before m. – meridiem = noon at bedtime h. s. h. – hora = hour s. – somni = sleep before meals a. c. a. – ante c. - cibum = meal after meals p. c. p. – post = after c. – cibum = meal as desired ad lib ad libitum = at one’s pleasure
  6. 6. frequency abbreviation explanation as necessary s. o. s. si opus sit = if it is necessary as needed p. r. n. pro re nata = as occasion requires immediately stat statim - immediately with c cum = with before a ante = before after p post = after
  7. 7. abbreviatio n explanation p.o. per orem = by mouth iv intravenous im intramuscular subQ; sq subcutaneous mg milligram mcg microgram IU International units
  8. 8. Drug Dosage parenteral meds: units of measurement: units/hr.; mg./hr.; mg./min.; mcg/min.; mcg/kg/min formula : dose = rate x concentration nonparenteral meds –  capsules & unscored tablets are rounded to the nearest whole tablet  Scored tablets are rounded to the nearest ½ tablet  Liquid meds are rounded to one decimal place (tenth) parenteral meds  Intradermal inj – 0.1 ml. or less  Subcutaneous – 1.0 ml or less  Intramuscular – 1.0 ml or less for older infants & young children; 2.0 ml or less for elderly thin adults & children; up to 3.0 ml in large muscles in well-developed adults
  9. 9. Dosage calculations Rate – always in ml./hr. Ratio & Proportion – equations containing ratios of equal value separated by colons or written as fractions. e.g. 2 : 6 = 4 : 12 – the two inner numbers, 6 & 4, are the “means”; the two outer numbers, 4 & 12, are the “extremes”. The product of the means must equal the product of the extremes.
  10. 10. Calculations Intravenous calculations – drop factor  macrodrop – factor of 10, 15, or 20 drops per ml  microdrip – 60 gtts/ml Formula for calculating iv flow rate (ugtts): V1/T1 = V2/T2 where V1 – volume to infuse; T1 – time to infuse; V2 – drop factor; T2 - time in minutes e.g. 200ml D5LR to be infused within 4 hrs. 200/4hrs = 12000 ugtts/240 mins = 150ugtts/min
  11. 11. Calculations  600 ml to be infused within 3 hrs.  10 gtts/ ml : 600ml = 6000 gtts; 3 hrs = 180 min • 6000 gtts / 180 mins = 33 gtts/min  15 gtts/ml : 600 ml = 9000 gtts; • 9000 gtts / 180 min = 50 gtts/min  20 gtts/ml : 600 ml = 12000 gtts • 12000 gtts/180 min = 67 gtts/min
  12. 12. Pediatric Calculations Based on body surface area  BSA is determined from a normogram  Formula: child’s BSA /1.7 sq. m. x adult dose Based on body weight:  Convert child’s weight to kg. (1 kg. = 2.2 lb)  Calculate the medication dose, then the daily dose, then divide the daily dose by the number of doses/day
  13. 13. Pediatric calculations  e.g. Amoxycillin : 30-50 mg./kg. body wt prep: gtts 100mg/ml patient : 6 month old baby boy weighing 11 lbs  convert lbs to kg (11 lbs ÷ 2.2 = 5 kg)  compute total daily dose (5kg x 30-50mg/kg = 150-250 mg)  divide total daily dose into 3 (150 – 250 mg ÷ 3 = 50-80 mg)  compute amount of medicine(0.5-0.8 ml.) = dose TID
  14. 14. Thank You !
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