1 doctor weighed in:

How long does it take for benzocaine to take effect?

1 doctor weighed in
Dr. Clifford Gevirtz
Anesthesiology

In brief: Less than 3 minutes

On a mucus membrane, slightly longer on skin.
Be careful of over application as large doses can lead to met hemoglobinemia which looks like your lips and skin turn blue. In high concentrations can be very dangerous.

In brief: Less than 3 minutes

On a mucus membrane, slightly longer on skin.
Be careful of over application as large doses can lead to met hemoglobinemia which looks like your lips and skin turn blue. In high concentrations can be very dangerous.
Dr. Clifford Gevirtz
Dr. Clifford Gevirtz
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