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However, the dangers of this method of reception greatly outweigh its advantages. In short, the use of subcutaneous injection needles effectively bypasses all natural filtration systems in the body, delivering foreign matter directly to the circulatory system. Even a neat injection, performed by a trained person in practical terms, in sterile conditions and using pure pharmaceutical preparations, also does not exclude risk. But in conditions of questionable hygiene, untrained consumers, when using substances from the black market and without knowledge of the purity of this method, it is extremely risky. A greater risk of ravitation of addiction and a short arrival are the reasons for more frequent intake of the substance. The main disadvantages of this method of administration: ease of infection, additional needle consumption, problems with the purity of the drug.
I will not go into the details of this method of administration, there are many guides on the Internet for safe injection, and I personally do not see the need to inject anything that can be swallowed, inhaled or smoked. But let me tell you a little bit about this: if you are going to give an injection, then ALWAYS use sterile needles for ANY injection, do not exchange needles, and finally, when injecting, it is vital that the solution is sterile and clean. If you collate a diluted drug, then you significantly increase the risk to life or health. Do not cut anything without knowing how clean the drug is. More on that below.

What quantity can cause overdose?

Short answer:
Depends on the person. But 50 milligrams of pure amphetamine is toxic to a person who does not have the appropriate tolerance (this is an example for hypersensitive people, also amphetamine is rarely in pure form, so it is better to read "less than 50 mg." The lethal dose for a rat is 55 mg/kg orally (Merck Index).
Long answer:
At a very close recreational dose, the overdose-causing dose is difficult to establish precisely, due to differences between people. Death also occurred when taking such low doses as 1.3 mg / kg (i.e., the dose level is equivalent to 1.3 mg of amphetamine per kilogram of body weight of the consumer; for example, for a person weighing 80 kg, the dose will be about 104 mg.), doses from 1, up to 5 grams were also reported for, without toxic effects. These examples show differences in overdose rates. People who have allergic reactions to the components of the drug taken (remember that mixtures can be added to these drugs, which can reach significant amounts, due to lack of control over synthesis and dilution) or anemic people have a higher risk of overdose when taking small doses. People who consume frequently tend to tolerate higher doses. Because of the difficulty of determining the dose causing an overdose, it is necessary to take consumption seriously and know your own limits. It is also important to recognize the symptoms of overdose.
Symptoms of acute overdose: include anxiety, increased breathing, sweating, tremors and nausea. The presence of these symptoms usually indicates only a mild level of toxicity and you can just wait a while, drink water and try to calm down.
Symptoms of high overdose are nausea, diarrhea, abdominal cramps, hallucinations, panic attacks, paranoia and circulatory disorders. Everybody, jump. Next - "Shorty", and then - by symptoms. Someone in Sklif or Janik, someone in Kanatchikov’s dacha (amphopsychosis is a very real thing).