Converting Grams to Milligrams

Oct 13, 2025 by wbrum.org 128 views

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Introduction

Cephalexin, commonly known as Keflex, is a widely used antibiotic medication prescribed to treat various bacterial infections. When a doctor orders a specific dose of Keflex, it's essential to understand the dosage instructions to ensure accurate administration. In this article, we'll explore how to calculate the number of Keflex tablets needed based on a doctor's order for 1.38 g of the medication.

Understanding the Dosage

To calculate the number of tablets needed, we first need to understand the dosage instructions. The doctor has ordered 1.38 g of Keflex, which is available in 250 mg tablets. The key to this calculation is to convert the ordered dose from grams to milligrams, as the tablets are measured in milligrams.

Converting Grams to Milligrams

To convert grams to milligrams, we use the conversion factor: 1 g = 1000 mg. Therefore, we can convert 1.38 g to milligrams by multiplying it by 1000.

1.38 g × 1000 mg/g = 1380 mg

Calculating the Number of Tablets

Now that we have the ordered dose in milligrams (1380 mg), we can calculate the number of tablets needed. Each tablet contains 250 mg of Keflex. To find the number of tablets, we divide the ordered dose (1380 mg) by the dose per tablet (250 mg).

Number of tablets = 1380 mg ÷ 250 mg/tablet = 5.52 tablets

Rounding the Number of Tablets

Since we can't have a fraction of a tablet, we need to round the calculated number of tablets to the nearest whole number. In this case, we round 5.52 tablets to 6 tablets.

Conclusion

In conclusion, to calculate the number of Keflex tablets needed based on a doctor's order for 1.38 g of the medication, we first convert the ordered dose from grams to milligrams. Then, we divide the ordered dose in milligrams by the dose per tablet to find the number of tablets needed. Finally, we round the calculated number of tablets to the nearest whole number.

Frequently Asked Questions

Q: What is the conversion factor for grams to milligrams?

A: The conversion factor for grams to milligrams is 1 g = 1000 mg.

Q: How do I calculate the number of tablets needed?

A: To calculate the number of tablets needed, divide the ordered dose in milligrams by the dose per tablet.

Q: Can I have a fraction of a tablet?

A: No, you can't have a fraction of a tablet. You need to round the calculated number of tablets to the nearest whole number.

References

[1] Keflex (cephalexin) [package insert]. (2020). Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/017-0323s046lbl.pdf
[2] Cephalexin. (2022). In Merck Manual [Online]. Retrieved from https://www.merckmanuals.com/professional/drugs/antibiotics/cephalosporins#v115177

Additional Resources

[1] American Academy of Family Physicians. (2022). Antibiotic Use in Adults. Retrieved from https://www.aafp.org/patient-care/clinical-recommendations/all/antibiotic-use-adults.html
[2] Centers for Disease Control and Prevention. (2022). Antibiotic Resistance Threats in the United States. Retrieved from https://www.cdc.gov/drugresistance/pdf/ar-threats-2022-508.pdf

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Introduction

Calculating the correct dosage of Keflex (cephalexin) is crucial to ensure effective treatment of bacterial infections. In our previous article, we discussed how to calculate the number of Keflex tablets needed based on a doctor's order for 1.38 g of the medication. In this article, we'll address some frequently asked questions related to Keflex dosage and provide additional information to help you better understand this medication.

Q&A

Q: What is the typical dosage of Keflex for adults?

A: The typical dosage of Keflex for adults is 250-500 mg every 6 hours, or 500-1000 mg every 12 hours.

Q: How long should I take Keflex?

A: The duration of Keflex treatment depends on the type and severity of the infection. Typically, Keflex is taken for 7-14 days.

Q: Can I take Keflex with food or milk?

A: Yes, you can take Keflex with food or milk to reduce stomach upset. However, it's essential to take Keflex with a full glass of water to ensure proper absorption.

Q: What are the common side effects of Keflex?

A: Common side effects of Keflex include nausea, vomiting, diarrhea, stomach pain, and headache.

Q: Can I take Keflex if I'm pregnant or breastfeeding?

A: Consult your doctor before taking Keflex if you're pregnant or breastfeeding. Keflex may not be suitable for pregnant or breastfeeding women, especially during the first trimester or in high doses.

Q: How do I store Keflex tablets?

A: Store Keflex tablets in a cool, dry place, away from direct sunlight and moisture. Keep the tablets out of reach of children and pets.

Q: Can I take Keflex with other medications?

A: Consult your doctor before taking Keflex with other medications, especially antibiotics, antacids, or blood thinners. Keflex may interact with other medications, reducing their effectiveness or increasing the risk of side effects.

Q: What should I do if I miss a dose of Keflex?

A: If you miss a dose of Keflex, take it as soon as you remember. However, if it's almost time for your next dose, skip the missed dose and continue with your regular dosing schedule.

Q: Can I take Keflex if I have kidney or liver disease?

A: Consult your doctor before taking Keflex if you have kidney or liver disease. Keflex may not be suitable for individuals with severe kidney or liver impairment.

Additional Information

[1] Keflex (cephalexin) [package insert]. (2020). Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/017-0323s046lbl.pdf
[2] Cephalexin. (2022). In Merck Manual [Online]. Retrieved from https://www.merckmanuals.com/professional/drugs/antibiotics/cephalosporins#v115177

Resources

[1] American Academy of Family Physicians. (2022). Antibiotic Use in Adults. Retrieved from https://www.aafp.org/patient-care/clinical-recommendations/all/antibiotic-use-adults.html
[2] Centers for Disease Control and Prevention. (2022). Antibiotic Resistance Threats in the United States. Retrieved from https://www.cdc.gov/drugresistance/pdf/ar-threats-2022-508.pdf

Conclusion

Calculating the correct dosage of Keflex and understanding its usage, side effects, and interactions is crucial to ensure effective treatment of bacterial infections. By addressing frequently asked questions and providing additional information, we hope to have helped you better understand Keflex and its role in treating various infections. If you have any further questions or concerns, consult your doctor or pharmacist for guidance.