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It depens with medicine you need to inject and in which place of your body.

For deep muscles, you use longer needles (1 to 1 1/2 inches).

It also depens of the drug viscosity. For "oily" products, you need to use bigger needles (18 to 22 gauges).

For regular subcutaneous injection (liquid form) you can use 1 inch needle with a gauge of 27 to 30.

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11y ago

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