Also known as: Anastrozole
Generic Arimidex is brand name for anastrozole, an oral antiestrogen. Generic Arimidex inhibits the enzyme aromatase in the adrenal glands that produces the estrogens (estradiol and estrone) and thereby lowers their levels. Generic name of Generic Arimidex is Anastrozole. Arimidex is also known as Anastrozole. Brand name of Generic Arimidex is Arimidex.
The following information describes Arimidex dosages that are commonly used or recommended. However, be sure to take the dosage your doctor prescribes for you. Your doctor will determine the best dosage to fit your needs.
Drug forms and strengths
Arimidex comes as 1-mg tablets that are taken by mouth.
Dosage for breast cancer
The usual dosage of Arimidex for breast cancer is one tablet taken once a day. It’s best to take your dose at the same time each day.
What if I miss a dose?
If you forget to take a dose of Arimidex, take the missed dose as soon as you remember. However, if it’s almost time for your next dose, just skip the missed dose and take your next dose as usual. Don’t take two doses together to make up for a missed dose.
To help make sure that you don’t miss a dose, try setting a reminder on your phone. A medication timer may be useful, too.
Will I need to use this drug long term?
Arimidex is meant to be used as a long-term treatment for breast cancer. If you and your doctor determine that Arimidex is safe and effective for you, you’ll likely take it long term.
The length of time that you’ll take this drug depends on the type of cancer you’re using it to treat. Below we describe the typical length of time that Arimidex is given. But to know for sure how long you should take Arimidex, talk with your doctor.
For advanced breast cancer
If you’re taking Arimidex to treat advanced breast cancer, you’ll usually take the drug for as long as your doctor feels this treatment is right for you. (With advanced breast cancer, the cancer has either spread to nearby areas or lymph nodes, called locally advanced breast cancer, or spread to other parts of your body, called metastatic breast cancer.)
For early breast cancer
If you’re taking Arimidex as adjuvant treatment of early breast cancer, you’ll usually take the drug for at least 5 years. Adjuvant treatment is used to lower the risk of your breast cancer coming back or spreading after it’s already been treated with surgery. (With early breast cancer, the cancer hasn’t spread out of either your breast or the lymph nodes in your armpit.)
It’s not currently known if Arimidex should be continued after these 5 years. And if so, it’s not known for how long after the first 5 years it should be taken.
Some studies found that breast cancer is less likely to come back if an aromatase inhibitor is taken for an additional 5 years after the first 5 years of adjuvant therapy. (Aromatase inhibitors are a class of medications.) With this approach to treatment, the drug would be taken for a total of 10 years. However, other studies didn’t show a benefit for extending the treatment beyond 5 the usual years.
In addition, one recent study found that taking Arimidex for a total of 10 years didn’t provide any more benefit than taking it for a total of 7 years.
How long you take Arimidex for early breast cancer will depend on how likely your breast cancer is to come back. It will also depend on your risk of side effects from treatment.
If you overdose Generic Arimidex and you don't feel good you should visit your doctor or health care provider immediately.
Store between 20 and 25 degrees C (68 and 77 degrees F) away from moisture and heat. Throw away any unused medicine after the expiration date. Keep out of the reach of children in a container that small children cannot open.