Sustanon 250: interaction with alcohol and medications
The prescribing information for any prescription drug contains a section on interactions, but it is rarely read carefully. For Sustanon 250 this section is especially important: testosterone alters the action of anticoagulants and glucose-lowering agents, affects test results, and combination with alcohol increases the burden on the heart and psyche. The editorial team has systematized the main interactions.
Why testosterone interacts with other substances
Pharmacological interactions are of two types. Pharmacokinetic ones change how the body absorbs, distributes, metabolizes or eliminates a drug. Pharmacodynamic ones - when two substances act on the same organs or processes, enhancing or weakening each other's effects.
The testosterone in Sustanon 250 has predominantly pharmacodynamic interactions. It affects protein synthesis in the liver, in particular clotting factors and transport proteins, the sensitivity of tissues to insulin, the number of red blood cells and fluid retention. Any other drug that acts on these same systems potentially interacts with it.
Injectable testosterone, unlike oral 17-alpha-alkylated steroids, does not undergo a first pass through the liver and is not considered significantly hepatotoxic. However, this does not mean the absence of interactions: they are due to the systemic effects of the hormone, not to direct toxicity.
It is also important that in non-medical use Sustanon 250 is rarely the only substance. Reviews indicate that people who use anabolic steroids often combine them with other drugs, alcohol or psychoactive substances, and polypharmacy sharply complicates the prediction of risks.
Alcohol and Sustanon 250
There is no direct chemical interaction between ethanol and testosterone, but their effects overlap. Alcohol itself reduces testosterone production, affecting the hypothalamus, pituitary and testes, and also enhances aromatization in the liver. Systematic alcohol consumption worsens male reproductive function - this is described in detail in the review by Emanuele and Emanuele.
The cardiovascular system receives a double burden. Androgens in high doses raise blood pressure, lower good cholesterol and can cause myocardial hypertrophy. Alcohol also raises blood pressure and is a known trigger of rhythm disturbances, in particular atrial fibrillation.
Another aspect is behavior. Supraphysiological doses of androgens increase irritability and impulsivity in some people. Alcohol reduces self-control. The combination of these factors raises the risk of conflicts and injuries, which is noted in scientific reviews of the consequences of non-medical androgen use.
The liver does not stay out of it either. Although injectable testosterone has little effect on it, alcohol is the main cause of toxic liver damage. When oral steroids appear in non-medical regimens, the total burden on the liver becomes significant.
Interactions with medications from the prescribing information
The prescribing information for Sustanon 250 lists several groups of drugs with which caution is needed. The table below shows the main ones and the practical significance of the interaction.
| Group of drugs | The essence of the interaction | What the doctor does |
|---|---|---|
| Oral anticoagulants (warfarin and other coumarins) | Androgens enhance the anticoagulant effect, risk of bleeding | Monitors INR more often, adjusts the anticoagulant dose |
| Insulin and oral glucose-lowering agents | Androgens may improve insulin sensitivity and reduce the need for it | Monitors glycemia, reduces the dose if necessary |
| Corticosteroids, ACTH | Increased fluid retention and edema | Caution in heart and kidney diseases |
| Inducers of liver enzymes | May change the testosterone level | Takes into account when interpreting tests |
The interaction with anticoagulants is especially important: it can be clinically significant and lead to dangerous bleeding. For people taking warfarin, any use of androgens is possible only under a doctor's supervision with more frequent determination of INR.
For people with diabetes, a change in insulin sensitivity can cause hypoglycemia if the dose of glucose-lowering drugs is not adjusted. Therefore the endocrinologist must know about any hormonal therapy.
It is worth mentioning separately drugs that are not in the prescribing information but are often combined in practice: erectile dysfunction remedies, antihypertensive drugs, statins. No direct dangerous interactions with testosterone have been described for them, but their combination requires general monitoring of cardiovascular status.
Effect on laboratory tests
Testosterone changes a number of laboratory indicators, and this too is a kind of interaction - with diagnostics. A doctor who does not know about androgen use may misinterpret the results.
- Thyroid hormones:androgens lower the level of thyroxine-binding globulin, so total T4 may be lower, while free T4 and TSH remain normal.
- Complete blood count:an increase in hemoglobin and hematocrit due to stimulation of erythropoiesis.
- Lipid panel:a decrease in HDL, especially at high doses.
- PSA:a moderate increase when the testosterone level is restored.
- Gonadotropins:a sharp decrease in LH and FSH.
A high hematocrit is important from the standpoint of interactions too: combined with dehydration, smoking or drugs that raise thrombotic risk, it increases the viscosity of the blood. Clinical guidelines recommend monitoring hematocrit during testosterone therapy and reviewing treatment if it rises significantly.
Practical advice: before any test, inform the doctor about all the drugs you use, including hormonal ones. This will speed up diagnosis and save you from unnecessary additional examinations.
Solution composition, allergy and practical tips
The solvent in Sustanon 250 is peanut oil, and the preservative is benzyl alcohol. According to the prescribing information, the drug is contraindicated in people allergic to peanut or soy. This is an example of an interaction that is often forgotten: the reaction occurs not to the active substance but to the excipients.
Benzyl alcohol in large quantities is dangerous for newborns and young children, so the prescribing information separately warns about use in this age group. For adults it poses a risk mainly in cases of individual hypersensitivity.
A few general safety rules regarding interactions:
- keep an up-to-date list of all medications, supplements and hormonal drugs;
- inform every doctor about hormonal therapy, including your dentist and surgeon;
- do not combine androgens with alcohol and psychoactive substances;
- do not change the doses of other drugs on your own, even if indicators have changed.
If you take anticoagulants, diabetes drugs, corticosteroids or have a peanut allergy, any use of androgens should be discussed with a doctor in advance.
Editorial conclusions
Sustanon 250 has clinically significant interactions: it enhances the action of anticoagulants, changes the need for glucose-lowering drugs, increases edema against the background of corticosteroids and affects a number of laboratory indicators.
Alcohol does not enter into a direct chemical reaction with testosterone, but their effects on the heart, blood pressure, hormonal system and behavior overlap and increase the risks.
The excipients of the drug - peanut oil and benzyl alcohol - have their own contraindications, which are important to remember.
We also recommend reading our materials on the metabolism of Sustanon 250, on its effect on the prostate and on how to recognize a counterfeit of the drug.
References
- Sustanon 250 mg/ml solution for injection. Summary of Product Characteristics (SmPC).
- Emanuele MA, Emanuele NV. Alcohol's effects on male reproduction. Alcohol Health Res World. 1998;22(3):195–201.
- Pope HG Jr, Wood RI, Rogol A, et al. Adverse health consequences of performance-enhancing drugs: an Endocrine Society scientific statement. Endocr Rev. 2014;35(3):341–375.
- Bhasin S, Brito JP, Cunningham GR, et al. Testosterone therapy in men with hypogonadism: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2018;103(5):1715–1744.
- Kicman AT. Pharmacology of anabolic steroids. Br J Pharmacol. 2008;154(3):502–521.
- Baggish AL, Weiner RB, Kanayama G, et al. Cardiovascular toxicity of illicit anabolic-androgenic steroid use. Circulation. 2017;135(21):1991–2002.
Andriy Melnyk
A strength-sports coach and author of programs for beginner and intermediate levels. Writes about training planning.
