• Testosterone Phenylpropionate: Uses, Side Effects and Common Brands

  • Testosterone phenylpropionate is a naturally produced hormone by the body that is predominant in the male testicles. The signs of low testosterone in boys are early or late puberty and in men are the following: infertility, impotence, low level of sexual interest, thinning of the bones. In order to evaluate testosterone levels, it is important to make a simple blood test.

    Testosterone phenylpropionate is a slow-acting ester which has a release time of 1 to 3 weeks. Testosteronephenyl propionate is a drug that belongs to the androgens class of drugs. It is one of the components of Sustanon and Omnadren. Testosterone phenyl propionate is available for administration as injection. The injection has an active life of four to five days. It may be used alone or in combination with other esters for androgen replacement therapy in males with confirmed testosterone deficiency. However, its most popular usage is for increasing muscular mass and strength.

    The overall action of the drug is promoting well-being through enhanced libido, immunity, energy, increasing muscle mass and increased fat loss. It is not recommended to use high doses of testosterone phenyl propionate due to high androgenic effects of the drug. The androgenic/anabolic effects of the drug depend on the administered dose. Athletes consider that higher the dose, better the results, but higher doses imply higher risks associated to negative effects on the liver. Testosterone phenyl propionate is considered to bring good results in increasing testosterone levels, gaining strength and muscle mass. Due to stimulation of the Androgen Receptors, testosterone phenyl propionate may cause accelerated muscle mass, increased fat loss, muscle repair and growth. Since the body increases its muscular mass at an accelerated rate, more ingested food is shuttled directly to the muscle tissue. It is an indirect effect of testosterone on fat loss.

    Testosterone phenylpropionate is traded under different brand names. Discuss with a doctor which drug is mostly suitable for you considering desired results and your particular medical condition. Use the dosage that will provide good results and will minimize the risk of developing serious adverse events.


    • Testosterone phenyl propionate is contraindicated in males with prostatic or breast carcinoma.
    • It should not be used in women while pregnant or breastfeeding.
    • Avoid testosterone phenyl propionate if you have a known or suspected hypersensitivity to it or to its active ingredient.

    How to Use

    Testosterone phenyl propionate is an oil based injectable solution. It is highly androgenic and anabolic. It is a long lasting ester that acts for a period up to 3 weeks. By its composition, it is similar to Methyltestosterone, but the only difference is that it has less side effects. Clinical studies have demonstrated that it is less toxic to the liver and it produces less aromatization and water retention. The dosage ranges from 100mg to 400mg a week. Generally, it is necessary to administer testosterone phenylpropionate two or three times a week in order to increase the effect of the hormone in the body and to maintain the blood levels. Testosterone phenylpropionate also has the ability to increase the levels of IGF-1 which is a highly anabolic hormone that promotes muscle growth.

    Important things to know about testosterone phenylpropionate:

    • If you do not tolerate injections, this drug may not be appropriate for you, since this is the only way of administering it.
    • The drug has duration of 3 to 4 days in the body, time in which the user feels stronger and more aggressive. Therefore, take into account all these fact before starting to take it in order to better control yourself.
    • It is important to combine the usage of testosterone with dieting and exercising, in order to increase the density and the mass of muscles.
    • Testosterone phenylpropionate is contraindicated in women due to high virilizing rating, which refers to the promotion of male characteristics. If used in therapeutic purposes, it is recommended to use the lowest effective doses in order to avoid any virilizing effects.

    Potential interaction with other drugs

    Before starting to use testosterone phenyl propionate, prevent your doctor about all medicines you are taking, including prescription and non-prescription ones. Generally testosterone phenylpropionate may be used concurrently with many drugs but there are still medications that in interaction with it may result in adverse reactions. Therefore, it should not be used concurrently with oral anticoagulants and antidiabetic drugs such as insulin. Discuss with a doctor all risks.

    Potential side effects

    Like all androgens, testosterone phenylpropionate may cause side effects. As already mentioned above, testosterone phenyl propionate is less toxic to the liver and produces less aromatization due to poor conversion of testosterone to estrogen, female sex hormone, and water retention. Therefore, reduction of estrogen excludes the risk of having prostate problems, acne or going bald. Testosterone phenylpropionate is also considered a mild substance and the side effect it may cause are less in comparison with other androgens. Taking into account the fact that it may be used as testosterone replacement therapy, one of the potential adverse events is suppression of the body’s natural production of hormone. The severity of adverse reactions depends on the administered dose and duration of action of the drug. There are many possible side effects associated with the use of testosterone phenylpropionate. Some of them are:

    • Gynecomastia (formation of breast tissue in males). It occurs due to conversion to estrogen, the female sex hormone.
    • Aggressive and dominant behavior.
    • Increased body/facial hair.
    • Women may experience virilization side effects, such as hoarseness of the voice, male pattern of baldness, irregular menstrual periods and enlarged clitoris.

    Even if the side effects are less common with testosterone phenyl propionate than with other androgens, it is important to take all measures of precaution before starting to use it, especially if you have existing heart diseases or liver disorders. Consult a doctor and get better informed about the risks and benefits from the therapy with testosterone and use the prescribed dosage with caution.


    • It is recommended to keep testosterone phenylpropionate at the room temperature below 30 degrees C.
    • Keep it out of the reach of children.
    • Avoid the direct sunlight, heat and moisture.
    • Safely discard the expired product by following the exact indications of a physician or pharmacist.
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