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math calculations with oral suspension (2)
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What are the total quantity and the total days supply for the following Rx: Renvela powder 2400 mg packet i packet po qam with breakfast qty: 30 ------------------------------------------------------------ The doctor has prescribed the brand-name drug Renvela oral suspension. The sealed carton contains 90 packets and each packet provides 2.4 grams of medicine. Notice that the doctor has written 2400mg packet, that is, 2.4g packet. Notice that 2400mg = 2.4g The doctor wants the pharmacist to dispense 30 packets. If 1 packet has 2.4 grams, then 30 packets have 72 grams. In turn, the total quantity to be dispensed is either 30 packets or 72 grams depending on the pharmacy computer system. The sig says: mix one packet as directed and take by mouth every morning with breakfast The patient will use one packet daily. In turn, the total days supply will be 30 packets divided by 1 packet which is 30 days. It is worth noting that the pharmacist will break the seal off the carton in order to dispense 30 packets. |
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What are the total quantity and the total days supply for the following Rx: EES 200 mg/5 mL disp: 100 mL sig: i tsp qid ------------------------------------------------------------ EES or E.E.S. means erythromycin ethylsuccinate The doctor has prescribed erythromycin ethylsuccinate 200mg/5mL oral suspension. The total quantity to be dispensed is 100 mL as stated by the doctor. The sig says: take 1 teaspoonful by mouth four times daily Notice that 1 tsp = 5 mL So, the patient will take 5 mL four times daily, that is, the patient will take 5 * 4 which is 20mL per day. The total days supply will be 100 divided by 20 which is 5 days. This medication is kept in the refrigerator. |
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What are the total quantity and the total days supply for the following Rx: Erythromycin ES 200/5 #20 mL 4 tsp via G tube one hour prior to appointment ------------------------------------------------------------ The doctor has prescribed erythromycin ethylsuccinate 200mg/5mL oral suspension. The total quantity to be dispensed is 20 mL as stated by the doctor. The sig says: take 4 teaspoonsful via G-tube one hour prior to appointment Notice that 1 tsp = 5 mL and then 4 tsp = 20 mL So, the patient will take 20 mL via G-tube. The total days supply is just 1 day. The G-tube is a gastrostomy tube, that is, a gastric feeding tube. This medication is kept in the refrigerator. |
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What are the total quantity and the total days supply for the following Rx: Erythromycin and Sulfisoxazole susp sig: 1 tsp po bid disp: 100 mL ------------------------------------------------------------ The total quantity is 100 mL as stated by the doctor. The doctor has prescribed Erythromycin and Sulfisoxazole oral suspension. But, the pharmacist will very likely dispense the generic drug E.S.P. oral suspension. This generic drug is a combination of 200mg of erythromycin and 600mg of sulfisoxazole. The sig says: take 1 teaspoonful by mouth twice daily The patient will take 5 mL twice daily. In other words, the patient will take 10mL per day. So, the total days supply will be 100mL divided by 10mL which is 10 days. |
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What are the total quantity and the total days supply for the following Rx: Griseofulvin 125mg/5mL #QS 3 tsp po qday x 6wk ------------------------------------------------------------ The doctor has prescribed an oral suspension. The sig says: take 3 teaspoonsful by mouth every day for 6 weeks In other words, the patient will take 3 teaspoonsful daily for 42 days. Notice that 1 tsp = 5 mL and then 3 tsp = 15 mL So, the patient will be taking 15 mL daily for 42 days. The total quantity to be dispensed is 15 * 42 which is 630mL The total days supply is 42 days as stated by the doctor. |
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What are the total quantity and the total days supply for the following Rx: Omnicef 125mg/5mL 2.5 cc po bid for 10 days Q.S. 10 days ------------------------------------------------------------ The doctor has prescribed the brand-name drug Omnicef 125mg/5mL oral suspension, but the pharmacist will very likely dispense the generic version cefdinir 125mg/5mL oral suspension. The sig says: take 2.5 mL by mouth twice daily for 10 days The patient will take 2.5 * 2 * 10 which is 50 mL So, the patient will take a total of 50 mL But, this medication comes in bottles of 60 mL and 100 mL only. So, the pharmacist will have to dispense a bottle of 60mL Therefore, the total quantity to be dispensed is 60 mL The total days supply is 10 days as stated by the doctor. It is worth noting that the doctor wrote '10 days' twice. It was not necessary for the doctor to write '10 days' twice. |
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Calculate the total quantity and the total days supply for the following Rx: Omnicef 125mg/5cc dispense: qs 10 days sig: 7 mg per kg by mouth bid child is 8.7 kg ------------------------------------------------------------ The doctor wants the pharmacist to dispense enough medicine to last 10 days. So, the total days supply is 10 days as stated by the doctor. The doctor has prescribed the brand-name drug Omnicef 125mg/5mL oral suspension, but the pharmacist will very likely dispense the generic version Cefdinir 125mg/5mL oral suspension. This prescription was written for a child who weighs 8.7 kilograms (kg). The sig says: give 7 mg per kg by mouth twice daily This drug is in a liquid form and thus we need to convert 7mg to mL The ratio given above is 125mg/5mL, that is, 5mL/125mg Then, we need to convert 7 mg into mL x / 7mg = 5mL / 125mg x = (7mg * 5mL) / 125mg x = 35mL / 125 x = 0.28 mL The child will take 0.28 mL per kilogram. We know that the child weighs 8.7kg and, in turn, the child will be taking 0.28mL * 8.7kg = 2.4mL Therefore, the child will be taking 2.4 mL twice daily. In turn, the final sig will say: give 2.4 mL by mouth twice daily for 10 days Now, we need to calculate the total quantity to be dispensed. The total quantity will be 2.4mL * 2 * 10 which is 48mL But, this medicine is supplied in bottles of 60mL and 100mL. In this case, the pharmacist will dispense one bottle of 60 mL Now, the pharmacist will improve the final sig directions: give 2.4 mL by mouth twice daily for 10 days. Then, discard the remainder. |
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Calculate the total quantity and the total days supply for the following Rx: Augmentin 800 mg bid po x 10 days disp: qs ------------------------------------------------------------ The total days supply is 10 days as stated by the doctor. The immediate question for the pharmacist is: Is this medication in the form of tablets or in the form of suspension? Considering that the doctor says for the pharmacist to dispense quantity sufficient (qs), the pharmacist decided to dispense suspension. The strength 800mg does not exist. So, the pharmacist chose Augmentin 400mg/5mL suspension and he doubled the dosage. In fact, the pharmacist dispensed the generic version amoxicillin-clavulanate 400mg/5mL suspension. The sig says: take 1 teaspoonful by mouth twice daily for 10 days Notice that 1 tsp = 5 mL and therefore the patient will take 5 mL twice daily for 10 days. But now, we need to double the dosage. So, the final sig will say: take 10 mL by mouth twice daily for 10 days The patient will take 10 * 2 * 10 which is 200 mL total So the total quantity to be dispensed is 200 mL In this case, the pharmacist dispensed two bottles of 100 mL each. It is worth noting that the pharmacist decided to dispense the generic equivalent to Augmentin suspension. But, some pharmacists would prefer to call the doctor in order to verify the sig and the dosage form. |
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Calculate the total quantity and the total days supply for the following Rx: azithromycin 100mg/5cc 100 mg po day 1 then 50 mg po days 2-5 #QS ------------------------------------------------------------ The doctor has prescribed Azithromycin 100mg/5mL oral suspension. This strength of azithromycin is usually prescribed for children. The total days supply is 5 days as stated by the doctor. The sig says: give 100mg by mouth on day 1 and then give 50mg on days 2 to 5 Now, we need to convert the dosages 100mg and 50mg into mL because this medication is in the liquid form. The ratio is 100 mg/5 mL Let us convert the dosage 100 mg into mL x / 100 mg = 5 mL / 100 mg x = (100 * 5) / 100 x = 500 / 100 x = 5 mL Now, let us convert the dosage 50 mg into mL x / 50 mg = 5 mL / 100 mg x = (50 * 5) / 100 X = 250 / 100 x = 2.5 mL The final sig will say: give 5mL by mouth on day 1 and then give 2.5mL on days 2 to 5 In this case, the patient will take 5 mL on day 1. Then, the patient will take 2.5 mL on days 2, 3, 4, and 5 which means the patient will take 2.5mL for four days, that is, 10mL In other words, the patient will be taking 5 mL and 10 mL, that is, a total of 15mL So, the total quantity to be dispensed is 15 mL |
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