PRIMOBOLMethenolone Enanthate injection is available in 100mg/ml ampoule and has a duration of action (due to the gradual transition of the drug from the muscles in the blood), at approximately 2 weeks. Methenolone has no estrogenic side effects, and its effects on cholesterol levels are minimal. In doses of 200 mg per week or less (intramuscular) blood pressure is rarely altered. It is possibly one of the safer anabolic steroids for females due to very low virilization effects in short-term usage.