Yes, steroids are drugs. The term covers two distinct categories of medication: corticosteroids, which are prescribed to reduce inflammation, and anabolic steroids, which are synthetic versions of testosterone. Both are real pharmaceutical drugs with legitimate medical uses, specific risks, and legal classifications. The confusion often comes from how casually the word “steroids” gets used in sports, fitness, and medicine to mean very different things.
Two Types of Steroids, Two Different Purposes
When most people hear “steroids,” they think of the muscle-building kind. But the steroids a doctor prescribes for asthma or a skin rash are an entirely different class of drug. Understanding the distinction matters because the two types work differently in the body, carry different risks, and are regulated differently by law.
Corticosteroids are synthetic versions of cortisol, a hormone your adrenal glands produce naturally. They work by dialing down your immune system’s inflammatory response. Doctors prescribe them for a wide range of conditions: asthma flare-ups, COPD exacerbations, rheumatoid arthritis, lupus, allergic reactions, multiple sclerosis relapses, and autoimmune blood disorders, among others. Common forms include oral tablets, inhalers, nasal sprays, topical creams, and injections.
Anabolic steroids are synthetic versions of testosterone, the primary male sex hormone. They promote muscle growth by ramping up protein production inside muscle cells. Their legitimate medical uses are narrow: treating hormone deficiencies in men, delayed puberty in adolescents, and muscle wasting caused by certain diseases. Outside those uses, they’re the drugs associated with doping scandals and bodybuilding culture.
How Each Type Works in the Body
Corticosteroids enter your cells and essentially tell your genes to stop producing the chemical signals that drive inflammation. They block the activity of key proteins that normally switch on inflammatory genes, while simultaneously boosting the production of anti-inflammatory proteins. The net effect is a fast, powerful reduction in swelling, redness, pain, and immune overactivity. This is why a short course of oral steroids can quickly calm a severe asthma attack or an autoimmune flare.
Anabolic steroids take a different route. They bind to androgen receptors inside muscle cells, then travel to the cell’s nucleus where they activate genes responsible for building protein. This triggers a cascade of growth signals: increased satellite cell activity (the stem cells that repair and enlarge muscle fibers), greater protein synthesis, and reduced muscle breakdown. The result is faster muscle growth and recovery than the body could achieve on its own. These same androgen receptors exist throughout the body, which is why anabolic steroids affect far more than just muscle tissue.
Legal Status
Corticosteroids are standard prescription medications. They are not controlled substances, and any licensed provider can prescribe them. You can pick up a corticosteroid inhaler or a tube of hydrocortisone cream without any special regulatory hurdles.
Anabolic steroids carry a much stricter classification. In the United States, they are Schedule III controlled substances under the Controlled Substances Act, the same category as ketamine and some barbiturates. Possessing them without a valid prescription is a federal crime. They are also banned by virtually every major sports organization worldwide.
Your Body Already Makes Steroids
Both drug categories are based on hormones your body produces on its own. Your adrenal glands sit on top of your kidneys and manufacture cortisol every day, regulating your stress response, blood sugar, and immune function. Your reproductive glands produce testosterone (in larger amounts in men, smaller amounts in women), which influences muscle mass, bone density, and sex drive.
All of these natural steroid hormones start from the same raw material: cholesterol. Your cells take cholesterol from the bloodstream, shuttle it into the mitochondria, and convert it through a series of enzymatic steps into a precursor molecule called pregnenolone. From there, different tissues modify pregnenolone into cortisol, testosterone, estrogen, or other steroid hormones depending on what the body needs. So when people say “steroids are drugs,” they’re referring to the synthetic pharmaceutical versions of chemicals your body already relies on.
Side Effects of Corticosteroids
Short courses of corticosteroids (a week or two at moderate doses) are generally well tolerated. The problems tend to emerge with long-term or high-dose use. Doses at or above 40 mg daily of a common oral corticosteroid are considered high-dose, and they increase the risk of elevated blood pressure and blood sugar. Over months, sustained use can push blood sugar high enough to trigger new-onset diabetes or worsen existing diabetes.
Long-term corticosteroid use also suppresses your adrenal glands. Because you’re getting synthetic cortisol from the outside, your body gradually stops making its own. If you stop the medication abruptly, your adrenal glands can’t pick up the slack fast enough, leaving you exhausted, dizzy, and achy. This is why doctors taper the dose gradually rather than stopping all at once. Other long-term risks include bone thinning, weight gain (especially around the face and midsection), mood changes, and increased vulnerability to infections due to immune suppression.
At lower doses, around 10 mg daily or less, these risks drop significantly, and many people take low-dose corticosteroids for chronic conditions without major complications.
Side Effects of Anabolic Steroids
Because anabolic steroids flood the body with far more testosterone (or testosterone-like compounds) than it would produce naturally, the side effects reach across multiple organ systems. In men, the body responds to the external supply by shutting down its own testosterone production, which can shrink the testicles, reduce sperm count, and cause erectile dysfunction. These effects can persist for months or longer after stopping use.
Cardiovascular damage is one of the most serious long-term concerns. Anabolic steroids shift cholesterol profiles in a harmful direction, raising levels of “bad” cholesterol while lowering the protective kind. They can also enlarge the heart muscle in ways that impair its function and promote stiffness in blood vessel walls. Together, these changes significantly raise the risk of heart attack and stroke, even in young, otherwise fit users.
Liver damage is another well-documented risk, particularly with oral anabolic steroids that pass through the liver. Psychological effects are common too: increased aggression, irritability, anxiety, and in some cases full mood disorders. In women, anabolic steroid use can cause deepening of the voice, facial hair growth, and menstrual irregularities, some of which may be irreversible. Adolescents who use anabolic steroids risk premature closure of their growth plates, permanently limiting their adult height.
Why People Confuse the Two
The word “steroid” is a chemistry term describing a specific molecular shape: four connected carbon rings. Both corticosteroids and anabolic steroids share that basic structure, which is why they share the name. But their effects on the body are almost opposite in some ways. Corticosteroids can cause muscle weakness and bone loss with prolonged use, while anabolic steroids build muscle and increase bone density. Corticosteroids suppress the immune system; anabolic steroids don’t.
If your doctor prescribes “steroids” for an inflammatory condition, they mean corticosteroids. These will not cause the muscle-building or masculinizing effects associated with anabolic steroids. And if someone at the gym talks about “being on steroids,” they almost certainly mean anabolic steroids, not the kind prescribed for allergies or arthritis.