Exemestane 25 mg - British Dragon

Buy Aromasin 25 mg tablets by British Dragon at XSteroids. Aromasin is the brand name of exemestane, the steroidal aromatase inhibitor that inactivates the enzyme rather than just occupying it. British Dragon supplies it as 25 mg tablets, 100 per pack. This guide covers how it differs from the other inhibitors, aromasin dosage practice and the side effect profile.

Exemestane is a prescription medicine used in breast cancer treatment, so the information below is educational only.

About Exemestane by British Dragon

Exemestane is an oral steroidal aromatase inhibitor, classified as a Type I irreversible inactivator. It is structurally related to the natural substrate of the enzyme, 4-androstenedione, and works as a false substrate: the enzyme processes it and is destroyed in the process rather than simply blocked. That is the fundamental difference from Anastrozole and Letrozole, which are nonsteroidal, reversible Type II inhibitors.

Medically it is used for estrogen receptor positive breast cancer in postmenopausal women, alongside surgery or radiotherapy, and it is contraindicated in premenopausal women, including during pregnancy and breastfeeding.

How Exemestane Works

Mechanism of Action

Because exemestane inactivates aromatase irreversibly, the enzyme has to be resynthesised before estrogen production can resume. This is why its clinical duration of action, four to five days, is far longer than its 24 hour half-life would suggest - the drug disappears from the blood long before its effect does.

Half-Life and Clearance Route

Bioavailability is around 60%, protein binding is 90%, and metabolism runs through CYP3A4 and aldo-keto reductase. Excretion is roughly equal between urine and faeces, with the parent compound accounting for only about 1% of what appears in urine - which is why the metabolites, not the drug itself, dominate the picture.

Aromasin Dosage and Estrogen Control

Dosing

The medical dose is 25 mg once daily. In practice many users split that or use it on alternate days, precisely because the enzyme stays inactivated for days after each dose. The 25 mg tablet is a robust unit, so a split dose has to be planned rather than guessed.

What Over-Suppression Looks Like

Estrogen is not an enemy; crusing it flattens libido, dries out joints and worsens lipids. The recurring error with any AI is treating it as mandatory on every cycle. The right approach is to establish a baseline with blood work, add the inhibitor only when estradiol is genuinely high, and re-test rather than escalate on feel.

Exemestane vs Anastrozole and Letrozole

The three inhibitors in this catalog split into two groups. Anastrozole and Letrozole are nonsteroidal and reversible; letrozole is the most potent of the three, which is why it belongs in problem cases rather than routine use. Exemestane is steroidal and irreversible, and it has one quirk worth knowing: it carries weak androgenic activity, so at high doses it can produce acne and some weight gain. SERMs such as Tamoxifen and Clomiphene are a different tool entirely and are used for recovery rather than on-cycle control, while Mesterolone is an androgen, not an inhibitor.

Exemestane Side Effects and Precautions

Because the drug works by removing estrogen, the most common effects are those of estrogen deficiency: hot flushes and sweating in more than 10% of patients, plus insomnia, headache and joint pain, with nausea and fatigue also frequent. A decrease in lymphocytes has been observed in roughly 20% of patients, particularly those with pre-existing lymphopenia, which is a reason for periodic blood work rather than assumption. Androgenic side effects such as acne can appear at supratherapeutic doses. It must not be used by premenopausal women or during pregnancy, and long-term use affects bone density.

Storage Instructions

Store the tablets at room temperature in a dry place, away from direct light and moisture. Keep the pack sealed until use and always store it out of the reach of children.

Why Buy Aromasin from XSteroids?

At XSteroids you buy the British Dragon Exemestane tablets directly from the brand catalog, with secure checkout, US domestic shipping in 3 to 6 days and international delivery in 12 to 26 days. Browse the full range on the British Dragon brand page to complete your cycle support.