Hydrofluoric acid absorption requires further medical treatment; calcium gluconate may be injected or administered intravenously. Crack cocaine can also be injected intravenously with the same effect as powder cocaine. I have never injected myself or had anyone inject me with anything. In medical settings, ketamine is usually injected intravenously or intramuscularly. It can be injected directly into an affected joint, or intravenously for less localized disorders. Arthus repeatedly injected horse serum subcutaneously into rabbits. In rare cases people have injected mushroom extracts intravenously. Tianeptine has been intravenously injected by drug users in Russia. Symptoms usually subside with diphenhydramine injected intramuscularly. If this is not sufficiently effective, then cold normal saline may be injected and removed. It can be injected intramuscularly to treat Vitamin B deficiency. Venom is injected directly into a vein. Venom is injected into the abdominal cavity. The fluid is injected into a heated metal block, and evaporates quickly. When an episode sets in, the apomorphine is injected subcutaneously, and signs subside.