The agent most commonly used for injection sclerotherapy of haemorrhoids is 5% phenol in almond oil. This is also know as Gabriel's solution. Arachis oil may be used instead of almond oil if wished;
The solution is viscous and it is conventional to use a wide bore plastic tube to draw up the solution instead of a needle. This prevents people stabbing themself with the needle and the solution is easier to draw up through the wide bore plastic tube.