Does Finasteride Increase Muscle Mass? Exploring the Effects Beyond Hair Loss

WrittenbyLuat Duong
Last updated

Finasteride, a widely-used medication for the treatment of male pattern baldness and benign prostatic hyperplasia, has been the subject of much discussion regarding its potential impact on various aspects of physical health, including muscle mass. As individuals interested in maintaining or building muscle often consider the effects of different medications, it's crucial to understand the relationship between finasteride and muscle mass. In this article, we'll explore the question: does finasteride increase muscle mass?

Does Finasteride Increase Muscle Mass?

The short answer is that finasteride does not directly increase muscle mass. In fact, some research suggests that finasteride may have a neutral or even slightly negative effect on muscle mass in certain individuals. It's important to understand the underlying mechanisms and factors that contribute to this relationship.

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The Role of Testosterone and Muscle Mass

To understand the potential impact of finasteride on muscle mass, it's essential to consider the relationship between testosterone and muscle growth. Testosterone is a key hormonal driver of muscle development and maintenance. It plays a crucial role in the process of muscle protein synthesis, which is the foundation for building and maintaining muscle mass.

Finasteride and Testosterone Levels

Finasteride is a 5α-reductase inhibitor, which means it blocks the conversion of testosterone to dihydrotestosterone (DHT), a more potent form of testosterone. By reducing DHT levels, finasteride can lead to a slight decrease in overall testosterone levels in the body. This reduction in testosterone levels could potentially have a negative impact on muscle mass, as lower testosterone levels may hinder the body's ability to effectively build and maintain muscle tissue.

Individual Variability in Response

It's important to note that the impact of finasteride on muscle mass can vary significantly from individual to individual. Some people may experience a more pronounced decrease in muscle mass, while others may not notice any significant changes. This variation can be attributed to factors such as individual differences in hormone metabolism, genetics, and overall health and fitness levels.

Potential Factors Influencing Muscle Mass Changes

In addition to the direct impact of finasteride on testosterone levels, there are other factors that may contribute to changes in muscle mass during finasteride use:

Age and Baseline Muscle Mass

Younger individuals with higher baseline muscle mass may be more likely to experience a noticeable decrease in muscle mass compared to older individuals or those with lower initial muscle mass. This is because younger, more muscular individuals may be more sensitive to changes in testosterone levels.

Exercise and Nutrition

The overall impact of finasteride on muscle mass can also be influenced by an individual's exercise routine and dietary habits. Individuals who maintain a consistent and effective strength training regimen, coupled with a balanced, protein-rich diet, may be able to offset any potential negative effects of finasteride on muscle mass.

Other Medical Conditions

Underlying medical conditions, such as thyroid disorders or hormonal imbalances, can also play a role in how the body responds to finasteride and its impact on muscle mass. It's essential to consider any pre-existing health factors that may influence the overall response to the medication.

Strategies to Maintain Muscle Mass with Finasteride

If you are concerned about the potential impact of finasteride on your muscle mass, there are several strategies you can consider to help maintain and potentially even build muscle during your treatment:

Strength Training

Engaging in regular, high-intensity strength training exercises can help stimulate muscle growth and offset any potential negative effects of finasteride on muscle mass. This may include weightlifting, resistance training, and bodyweight exercises.

Protein-Rich Diet

Ensuring a sufficient intake of high-quality protein, such as lean meats, fish, eggs, and plant-based sources, can support the body's muscle-building processes and help mitigate the impact of finasteride on muscle mass.


Depending on your individual needs and under the guidance of a healthcare professional, the use of certain supplements, such as creatine or branched-chain amino acids (BCAAs), may help support muscle maintenance and growth during finasteride treatment.

Monitoring and Adjustments

Regular monitoring of your muscle mass and physical performance, along with open communication with your healthcare provider, can help identify any significant changes and allow for timely adjustments to your treatment plan or lifestyle factors.


In conclusion, the relationship between finasteride and muscle mass is complex and can vary greatly from individual to individual. While finasteride does not directly increase muscle mass, it may have a neutral or slightly negative impact on muscle growth and maintenance in some cases due to its effect on testosterone levels. However, through a combination of strategic exercise, a balanced diet, and potentially targeted supplementation, individuals can take proactive steps to help maintain and even build muscle mass while undergoing finasteride treatment. It's essential to work closely with your healthcare provider to understand your individual response and make any necessary adjustments to your treatment plan and lifestyle to optimize your muscle health and overall well-being.

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Luat Duong

Luat Duong is a Copenhagen-based writer and content strategist specializing in hair loss and health. His work has been featured in MyHealthGuide, The Right Hairstyles, and Woman's Era. He is a graduate of Vaasa University. You can connect with him on LinkedIn.