When injecting without a vasoconstrictor, what is the maximum safe dose of 2% lignocaine solution for a 70Kg adult?

When considering the maximum safe dose of a local anesthetic like 2% lignocaine, it is essential to refer to standard guidelines, which take into account the concentration of the anesthetic and the patient's weight. For lignocaine, the typical maximum recommended dosage without a vasoconstrictor is approximately 5 mg/kg.

For a 70 kg adult, the calculation would proceed as follows:

1. Calculate the allowable dosage in milligrams: 70 kg × 5 mg/kg = 350 mg.

2. Understand the concentration of lignocaine: 2% lignocaine means there are 20 mg of lignocaine in each milliliter.

3. To find out how many milliliters correspond to 350 mg, you divide the total milligrams by the concentration: 350 mg ÷ 20 mg/ml = 17.5 ml.

This dosage guidelines and calculation demonstrate that the maximum safe dose is often presented differently depending on the available options. The maximum standard dosage suggestion, however, typically remains lower in practice due to safety concerns, leading practitioners to err on the side of caution when administering without a vasoconstrictor.

In conclusion, while the maximum dose calculation arrives at a higher value, 2.2