What is Aminoglutethimide: Uses, Dosage, Side Effects and More

Aminoglutethimide is a prescription medication that blocks your body's production of certain hormones, particularly cortisol and estrogen. This hormone-blocking action makes it useful for treating specific types of cancer and certain hormone-related conditions. While it's not commonly prescribed today due to newer treatment options, it can still be an important part of treatment plans for select patients when other medications aren't suitable or available.

What is Aminoglutethimide?

Aminoglutethimide belongs to a class of medications called aromatase inhibitors and adrenal suppressants. It works by interfering with enzymes that your body uses to make hormones like cortisol and estrogen. Think of it as putting a gentle brake on certain hormone production pathways in your body.

This medication was originally developed in the 1960s and has been used for decades to treat hormone-sensitive conditions. While newer medications have largely replaced it for many uses, aminoglutethimide still has specific situations where doctors find it helpful for their patients.

What is Aminoglutethimide Used For?

Aminoglutethimide is primarily used to treat advanced breast cancer that depends on estrogen to grow. It's also prescribed for Cushing's syndrome, a condition where your body produces too much cortisol hormone. Your doctor might consider this medication when other treatments haven't worked well or aren't suitable for your specific situation.

In breast cancer treatment, this medication helps by reducing estrogen levels throughout your body. Since some breast cancers need estrogen to grow and spread, lowering these hormone levels can help slow or stop the cancer's progression.

For Cushing's syndrome, aminoglutethimide works by blocking cortisol production in your adrenal glands. This can help reduce the uncomfortable and potentially serious symptoms that come with having too much cortisol in your system.

How Does Aminoglutethimide Work?

Aminoglutethimide is considered a moderately strong hormone-blocking medication. It works by inhibiting specific enzymes that your body needs to produce estrogen and cortisol. The medication essentially interrupts the chemical processes that create these hormones.

For estrogen blocking, it prevents the conversion of androgens into estrogen in various tissues throughout your body. This includes blocking estrogen production in fat tissue, muscle, and even in breast cancer cells themselves.

When treating Cushing's syndrome, the medication blocks an enzyme called 11β-hydroxylase in your adrenal glands. This enzyme is crucial for cortisol production, so blocking it helps reduce the excessive cortisol levels that cause Cushing's symptoms.

How Should I Take Aminoglutethimide?

Take aminoglutethimide exactly as your doctor prescribes, usually 2-4 times daily with meals. Taking it with food helps reduce stomach upset and improves how well your body absorbs the medication. Space your doses evenly throughout the day to maintain steady levels in your system.

Swallow the tablets whole with a full glass of water. Don't crush, chew, or break them, as this can affect how the medication is released in your body. If you have trouble swallowing tablets, talk to your doctor about options.

Your doctor will likely start you on a lower dose and gradually increase it over several weeks. This helps your body adjust to the medication and reduces the chance of side effects. Always follow your doctor's specific instructions, as dosing can vary based on your condition and individual response.

How Long Should I Take Aminoglutethimide For?

The length of treatment with aminoglutethimide varies greatly depending on your specific condition and how well you respond to the medication. For breast cancer, you might take it for months to years, while for Cushing's syndrome, the duration depends on whether it's being used as a temporary measure or long-term treatment.

Your doctor will monitor your progress through regular blood tests and check-ups to determine how long you should continue taking the medication. They'll look at factors like how well your condition is responding, any side effects you're experiencing, and your overall health status.

Never stop taking aminoglutethimide suddenly without talking to your doctor first. Your body may need time to adjust to the hormone changes, and stopping abruptly could cause withdrawal symptoms or allow your condition to worsen.

What Are the Side Effects of Aminoglutethimide?

Like all medications, aminoglutethimide can cause side effects, though not everyone experiences them. The most common side effects are usually mild and often improve as your body adjusts to the medication over the first few weeks of treatment.

Common side effects you might experience include:

• Drowsiness or fatigue, especially during the first few weeks
• Dizziness or lightheadedness when standing up
• Skin rash or itching
• Nausea or stomach upset
• Loss of appetite
• Headaches

These common side effects often fade as your body gets used to the medication. However, if they persist or become bothersome, let your doctor know so they can help you manage them.

More serious side effects are less common but require immediate medical attention. These can include severe skin reactions, signs of adrenal insufficiency (extreme fatigue, weakness, low blood pressure), or signs of thyroid problems (rapid heartbeat, sweating, weight changes).

Some people may experience rare but serious side effects such as severe allergic reactions, liver problems, or significant changes in blood cell counts. Your doctor will monitor you with regular blood tests to watch for these potential complications.

Who Should Not Take Aminoglutethimide?

Aminoglutethimide isn't suitable for everyone. You should not take this medication if you're pregnant or breastfeeding, as it can harm your baby. Women who could become pregnant need to use effective birth control while taking this medication.

People with certain medical conditions should avoid aminoglutethimide or use it only under very close medical supervision. These conditions include severe liver disease, active infections, or a history of serious allergic reactions to the medication.

If you have thyroid problems, diabetes, or heart disease, your doctor will need to monitor you more closely while you're taking aminoglutethimide. The medication can affect these conditions and may require adjustments to your other treatments.

Always tell your doctor about all medications, supplements, and herbal products you're taking. Aminoglutethimide can interact with many other medications, including blood thinners, seizure medications, and certain antibiotics.

Aminoglutethimide Brand Names

The most well-known brand name for aminoglutethimide is Cytadren, though this medication is now primarily available as a generic drug. In some countries, it may be available under other brand names or may need to be specially ordered by your pharmacy.

Since brand availability varies by location and the medication isn't as commonly prescribed today, your pharmacist may need to order it specifically for you. This is normal and doesn't mean there's anything wrong with your prescription.

Aminoglutethimide Alternatives

Several newer medications have largely replaced aminoglutethimide for most uses. For breast cancer treatment, newer aromatase inhibitors like anastrozole, letrozole, and exemestane are often preferred because they're more targeted and generally have fewer side effects.

For Cushing's syndrome, alternatives include ketoconazole, metyrapone, and mitotane. Your doctor might also consider newer medications like mifepristone or pasireotide, depending on the specific type of Cushing's syndrome you have.

The choice of alternative depends on your specific condition, other health factors, and how well you've responded to previous treatments. Your doctor will work with you to find the most suitable option for your individual situation.

Is Aminoglutethimide Better Than Other Hormone-Blocking Medications?

Aminoglutethimide isn't necessarily better or worse than other hormone-blocking medications – it's simply different. Newer aromatase inhibitors are often preferred for breast cancer because they're more selective and typically cause fewer side effects.

However, aminoglutethimide can be valuable in specific situations. Some patients may respond better to it than to newer medications, or they may not be able to take the newer drugs due to other health conditions or drug interactions.

Your doctor considers many factors when choosing the best medication for you, including your specific condition, overall health, other medications you're taking, and potential side effects. What works best varies from person to person.