Methyltestosterone: interaction with alcohol and drugs

Any drug rarely acts in the body "alone." Methyltestosterone has two properties that make its interactions especially important: it burdens the liver and affects the proteins and metabolism of other substances. The editorial team has examined what is known about methyltestosterone's interactions from official instructions and pharmacological sources and why the combination with alcohol is a separate problem.

Why methyltestosterone's interactions matter

Methyltestosterone belongs to the 17α-alkylated androgens. The methyl group at the 17α position protects the molecule from rapid breakdown in the liver, which is why the drug is active when taken orally. The price of this stability is hepatotoxicity: such androgens are associated with cholestasis, peliosis of the liver, and, with prolonged use, with liver tumors.

When the liver is already working under a load, any additional substance it metabolizes can become the "last straw." That is precisely why for methyltestosterone the interactions with alcohol and hepatotoxic drugs have not a theoretical but a practical significance.

The second mechanism of interactions is the effect of androgens on protein synthesis in the liver, in particular clotting factors and sex-hormone-binding globulin. The third is the effect on tissue sensitivity to insulin and on water-salt metabolism.

Below are the interactions noted in the official instructions for methyltestosterone preparations, as well as those that follow from known pharmacology. The editorial team does not describe "compatibility" with other androgens or sports drugs, since this goes beyond medical information.

Alcohol: a double burden on the liver

Alcohol is the most common substance with which methyltestosterone may be combined. Ethanol is metabolized mainly in the liver, causes fatty degeneration, inflammation, and, with systematic use, alcoholic hepatitis and cirrhosis.

The combination of two hepatotoxic factors means that the liver receives damage from two sides. There are no direct controlled studies specifically on the combination of methyltestosterone and alcohol, and they will not be conducted for ethical reasons. However, the principle of cumulative toxicity for the liver is well known in hepatology and is reflected in the guidelines on drug-induced liver injury.

A practical consequence is that the interpretation of tests becomes more complicated. An increase in transaminases (ALT, AST) or bilirubin may be the result of any of the factors, and it is harder for the doctor to determine the cause. Moreover, intense strength training itself raises AST, and sometimes ALT, due to muscle damage.

Alcohol also affects the hormonal background: systematic use lowers testosterone levels, worsens sleep and recovery, and increases the caloric content of the diet. So even outside the context of the liver the combination makes no sense at all.

Anticoagulants and glucose-lowering agents

The most clinically important interaction noted in the instructions for androgens is with oral anticoagulants such as warfarin. Androgens, especially 17α-alkylated ones, enhance the anticoagulant effect: they reduce the synthesis of certain clotting factors and increase sensitivity to the drug.

In practice this means an increase in the international normalized ratio (INR) and the risk of bleeding. The instructions note that patients receiving anticoagulants may need an adjustment of the anticoagulant dose and more frequent INR monitoring when starting or stopping androgen therapy. Such a decision is made only by a doctor.

The second group is insulin and oral glucose-lowering agents. Androgens can lower blood glucose levels and, accordingly, the need for these drugs in people with diabetes. The consequence may be hypoglycemia if the treatment is not adjusted.

For a person with diabetes this means that any hormonal drugs must be coordinated with an endocrinologist, and glucose self-monitoring must be more frequent during periods of therapy changes.

Corticosteroids, hepatotoxic drugs, and supplements

Corticosteroids and ACTH, according to the instructions, when combined with androgens can enhance fluid retention and edema. This is especially important for people with heart failure, kidney, or liver diseases, in whom edema can lead to decompensation.

As for hepatotoxic drugs in general, the LiverTox database of the U.S. National Institutes of Health describes androgenic steroids as a known cause of drug-induced liver injury. Combination with other drugs that have a similar potential logically increases the risk. Such agents include, for example, some anti-tuberculosis, antifungal, and anticonvulsant drugs, as well as paracetamol in high doses.

Isotretinoin, which is sometimes prescribed for severe acne, including acne caused by androgens, deserves separate mention. It can itself affect liver enzymes and lipids, so simultaneous use requires medical supervision.

Finally, herbal supplements. Some extracts popular in the sports community and among "weight-loss" products have been described as a cause of liver damage. The fact that an agent is sold as a supplement does not mean it is neutral for a liver that is already working under a load.

How to minimize the risks of interactions

The most reliable way to avoid dangerous interactions is not to use prescription androgens without medical indications. For those receiving any hormonal therapy under a doctor's supervision, specialists advise following several rules.

• Tell your doctor about all the drugs, supplements, and herbal remedies you are taking.
• Do not combine hormonal drugs with alcohol.
• Do not take antipyretic and analgesic agents in high doses without consultation.
• Take the tests prescribed by your doctor on time: liver panel, coagulogram, glucose.
• Seek help immediately in case of jaundice, dark urine, itching, unusual bleeding, or bruising.

For people taking warfarin or glucose-lowering agents, it is especially important not to change doses on their own but to coordinate any changes with a doctor.

It is also worth remembering pharmaceutical quality. Drugs from illegal circulation may contain a different substance or a different dose than indicated on the label, so predicting interactions in such a case is impossible altogether.

Editorial conclusions

Methyltestosterone has clinically significant interactions: with anticoagulants (risk of bleeding), glucose-lowering agents (risk of hypoglycemia), and corticosteroids (edema).

Combination with alcohol and hepatotoxic drugs increases the load on the liver, which is already high due to 17α-alkylation.

Transparency about all drugs and supplements in a conversation with a doctor is a simple but reliable way to avoid most problems.

We also recommend reading our articles on the hepatotoxicity of methyltestosterone, on the tests for monitoring during its use, and on how to recognize a counterfeit.

References

1. U.S. Food and Drug Administration. Methyltestosterone tablets/capsules: prescribing information (labeling).
2. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Androgenic Steroids. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases.
3. European Association for the Study of the Liver. EASL Clinical Practice Guidelines: Drug-induced liver injury. J Hepatol. 2019;70(6):1222–1261.
4. Solimini R, Rotolo MC, Mastrobattista L, et al. Hepatotoxicity associated with illicit use of anabolic androgenic steroids in doping. Eur Rev Med Pharmacol Sci. 2017;21(1 Suppl):7–16.
5. 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.
6. Preston CL (ed). Stockley's Drug Interactions. London: Pharmaceutical Press.