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# Adult Drug Calculations Formulae (To be given with Test) (1).doc

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Drug Calculation Formulae SI units Calculating doses (oral) Converting larger units into the next smaller unit A prescription chart informs you of the total dose To convert a larger unit into a smaller unit you that the patient is to receive. Your task is to find multiply by 1000. out the amount of drug in each tablet. Then you
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Drug Calculaton Formulae SI unisConvertng larger unis ino he nex smaller uni To convert a larger unit into a smaller unit you mulply by 1000.e.g.Convert 5g into milligrams:5 X 1000 = 5000 mgTo mulply by 1000 you move the decimal point 3 places to the right. Convertng smaller unis ino he nex larges uni To convert a smaller unit into a larger unit you divide by 1000.e.gConvert 1500g into ilograms:1500 ! 1000 = 1.5gTo divide by 1000 you move the decimal point 3 places to the le . Calculatng doses (oral) # prescripon chart in\$orms you o\$ the total dose that the paent is to receive. %our tas is to &nd out the amount o\$ drug in each tablet. Then you 'ould need to calculate ho' many o\$ the tablets 'ould be re(uired. The formula is:Amoun prescried (! ha #ou an\$) Amoun in each ale (! ha #ou\$ve go\$)% he numer of ales e.g. # paent is prescribed 300mg #llopurinol. The tablets are available as 100mg strength. )o' many 100mg are there in 300mg* or 300mg divided by 100mg.300mg100mg= 3 tablets &ou ma# also need o conver ha #ou an or ha #ou\$ve go ino he same S'I uni o enale #ou o mae his calculaton'   Calculatng doses  (li*uids) +hen a drug prescribed is in li(uid \$orm the availability is given in terms o\$ the concentraon o\$ the drug 'ithin a stated volume. #s long as the (uanty o\$ the drug is no'n and the concentraon o\$ the drug in the soluon is no'n the dose can be calculated. The formula ould e: Dose prescried + volume of soc solutonDose availale% volume re*uired e.g. 10mgs ,e-amethasone X 1ml= .5mls/mgml vials available   Calculatng Inravenous drip raes (in millilires per hour) +hen in\$using drugsuids via a syringe driver or volumetric in\$usion pump2 it is necessary to calculate the drip rate in millilitres per hour. The formula ould e:Toal volume o e infused%,aeTime o e infused over e.g.1000mls 0.4 odium Chloride= 15mlhr  Calculatng Inravenous drip raes (in drops per minue) Calculang drips per minute is necessary 'hen a pump cannot be obtained and the 6gravity7 method is used. The follo ing formula is used:,ae % -olume + Drops per ml Time in hours .inues per hour The number o\$ drops per ml 8 'ill be indicated on the pacaging o\$ the in\$usion set 9giving set. For the purposes of this calculaon exercise: ;lood 6thic7 uids = 15 drops per mlClear uids=0 drops per mle.g. # paent is to receive 1< 54 lucose in > hours.Calculate the rate in drops per minute using the standard giving set 90 drops per ml. 1000ml X 0 drops per ml > hours?0 minutes = 1000 X 0 = 0 000 > ?0 />0 = /0 drops per minue (o neares drop)   Duraton of an Infusion @t may somemes be necessary to tae2 given the rate 9on drops per minute at 'hich the in\$usion hasbeen set. The follo ing formula can e used:Time % -olume (mls) + Drops per ml,ae(drop per min) .ins per hr e.g.300ml elo\$usin is dropping at 0 drops per minute.The giving set delivers 15 drop per ml A ho' long 'ill the blood tae to in\$use*300ml elo\$usin X 15 drops per ml0 drop per minute ?0 Binutes per hour= 300 X 15=/500 0 ?0100   Calculatng drug dose according o od# eigh ome drug e.g. ancoagulant drugs and paediatricdrugs can be calculated in dose per ilogram o\$ body 'eight.To calculate a single dose you calculate the (uanty o\$ dose re(uired per day and divide it by the number o\$ doses. The follo ing formula is used:Toal dose per da# % Dose per g + 1eigh (in g)Single dose%Dose per da#2umer of dose e.g.# paent is prescribed a drug at 30mg per ilogram in 3 doses. The paent 'eights >0g.30mg 9per g X >0g = /00mg 9total dose per day/00mg 9total dose per day 3 doses 344mg 5er dose   Calculatng Dalaparin Doses  # paent is prescribed 13 000 units o\$ ,altaparin. %ou have a 0.ml pre &lled syringe 90 000 units in 1ml. )o' much A in volume do you give* 6o man# unis are in he 4'7ml pre 8lled s#ringe904 444 unis x 4'7mls % 3 444 unis1ha #ou anx -olume drug is in1ha #ou\$ve go; 444 x 4'7mls % 4'<=mls3 444
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