PRIMO 100

Methenolone Enanthate Injection

PRODUCT NAME & PACKAGING

Brand Name: PRIMO 100
Generic Name: Methenolone enanthate (also written as metenolone enanthate in some references)
Strength & Packaging: 10 mL multidose vial | 100 mg/mL

Primobolan Depot is historically associated with the injectable enanthate ester of methenolone, while oral Primobolan products were associated with the acetate form.

DESCRIPTION

PRIMO 100 is an oil-based injectable anabolic-androgenic steroid preparation containing methenolone enanthate, a long-acting ester of methenolone. Reference sources describe methenolone enanthate as an ester derivative of methenolone, a compound related to dihydrotestosterone (DHT) with weak androgenic activity and a moderate anabolic effect.

INDICATIONS

Historical reference sources describe methenolone as having been used in the treatment and prevention of muscle wasting due to disease, drug treatment, or other catabolic states, and older references also associate methenolone enanthate with treatment of anemia due to bone marrow failure / aplastic anemia. Because this specific 100 mg/mL, 10 mL brand presentation is not a current standard U.S. labeled reference product, it is best presented as a manufacturer-specific injectable formulation whose use should follow the product label, local regulation, and licensed-prescriber judgment.

DOSAGE & ADMINISTRATION

Route: Intramuscular injection

For a catalog-style entry, the safest professional wording is:
“Administer only under the direction of a licensed healthcare professional and in accordance with the manufacturer’s labeling, applicable regulations, and patient-specific clinical judgment.”

Public reference sources identify methenolone enanthate as an intramuscular product, but they do not provide a current standardized prescribing framework for this exact brand-specific vial presentation.

MECHANISM OF ACTION

Methenolone enanthate acts through androgen receptor agonism. As an esterified depot form, it releases active methenolone after administration; reference sources describe it as an androgen receptor agonist / anabolic steroid, and NCATS notes that methenolone binds strongly to androgen receptors.

PRECAUTIONS

Use requires careful professional oversight. Reference sources note potential concerns including fluid and electrolyte retention, hypercalcemia, interference with glucose tolerance and thyroid function tests, and suppression of the hypothalamic-pituitary-gonadal axis with possible reversible hypogonadism and infertility.

SIDE EFFECTS

Reported adverse effects associated with methenolone enanthate include masculinization / virilization-type effects such as acne, increased hair growth, voice changes, and increased sexual desire. Other cited adverse effects include fluid retention and skeletal/bone growth effects in susceptible settings.

STORAGE

Store in a tight container and protect from light. Additional toxicology reference text indicates that parenteral vials should be stored at room temperature (15°C to 30°C) and visually inspected before use.