[Fraggle]

Warming the oil definitely improves viscosity and allows it to enter the muscle with less discomfort. When short esters, high concentrations or excess benzyl alcohol are involved, you are still going to need to dilute or add benzyl benzoate to allow for the least painful injections.

NSAID's are rarely necessary, but can help when there is fascia displacement from large volume injections.

The anti-histamines are also only needed on a case-by-case basis. Some people are highly sensitive to certain carboxylic acids that are used to form the ester. Other people can be allergic to the oils -- though this usually results in massive inflammation that cannot be mistaken for anything else.

Cheers,
Fraggle