Has your doctor prescribed you or someone you know the drug Tamoxifen for breast cancer? When that happens, it's normal to have questions and feel a little scared. "What will happen?", "What are the side effects?", "What should I know?", etc. You probably have a lot of questions on your mind. So today, let's talk about all of that simply and clearly, as if you were talking to a friend.
What is Tamoxifen?
Simply put, tamoxifen is a special drug that is given to stop the growth of breast cancer cells and to treat cancer that already exists. Some types of breast cancer need a hormone called estrogen, which is naturally produced in our bodies, to grow, just like a plant needs water.
Think of these cancer cells as little enemies looking for "food" called estrogen. What the drug tamoxifen does is go into the breast tissue and block the way for this hormone estrogen to bind to the cancer cells. In other words, it stops the cancer cells from getting "food". Then those cells can't spread or grow any further.
Your doctor may prescribe this medicine for other conditions besides breast cancer. So always follow your doctor's instructions.
Things you need to tell your doctor before starting medication
Before you start taking this medication, it is very important to give your doctor a complete picture of your health condition. Because that information will determine how suitable this medication is for you and how it should be given. If you have any of the conditions below, be sure to inform your doctor.
| Situation you need to report | Why should you care? |
|---|---|
| If you have had blood clots or a stroke in the past | Tamoxifen may slightly increase the risk of blood clots. |
| Conditions such as uterine cancer, uterine fibroids, or endometriosis | It is important to be aware of this because this medication can affect the lining of the uterus. |
| Liver disease | Because the liver helps eliminate drugs from the body, it is important to know about its functions. |
| High cholesterol level in the blood | This medication can sometimes affect cholesterol levels. |
| If you are pregnant, trying to get pregnant, or are a breastfeeding mother | This is very important. This medicine can harm an unborn baby and can pass to the baby through breast milk. |
| If you have allergies to other medicines, foods or substances | This is important to know if you are allergic to Tamoxifen or any of its ingredients. |
How exactly do I use this medicine?
- Follow your doctor's instructions: Take the correct dosage exactly as prescribed by your doctor. Do not increase or decrease the dosage.
- Take it at the same time: Try to take your medicine at the same time every day as much as possible. Once you make this a daily habit, you're less likely to forget.
- With or without food: This medicine can be taken before or after meals. However, if you experience stomach upset or heartburn, it is better to take it with a meal.
- Don't stop: Don't stop taking your medication until your doctor tells you to. It's important to finish the prescribed course of medication, even if you feel better.
What to do if you miss a dose of medication?
If you forget to take a dose, take it as soon as you remember. However, if it is almost time for your next dose when you remember, skip the missed dose and take your next dose at the scheduled time. Never take two doses at once to make up for the missed dose.
What if you take too much medicine? (Overdose)
If you think you have taken too much medicine, don't panic. Immediately call the National Poisons Information Centre at the Colombo National Hospital, or go to the Emergency Treatment Unit (ETU) of the nearest hospital.
Other drugs that may interact with this medicine (Drug Interactions)
When some medications are taken together, they can affect each other's effectiveness. This is what we call a ``Drug Interaction''. Therefore, it is essential to tell your doctor about all the medications you are taking (including vitamins, herbal remedies, and supplements).
| Never take Tamoxifen with this medicine. | |
|---|---|
| - Cisapride | - Dronedarone |
| - Pimozide | - Thioridazine |
| Inform your doctor if you are taking these medications. | |
| - Other cancer drugs such as Anastrozole, Letrozole | - Blood thinners such as Warfarin |
| - Antidepressants such as Paroxetine | - Antiepileptic drugs such as Carbamazepine and Phenytoin |
| - Rifampin (a medicine for tuberculosis) | - Other medications that affect heart rhythm (QT interval) |
Things to be aware of when taking Tamoxifen
- Regular medical checkups: Be sure to keep your follow-up appointments with your doctor. They will monitor your progress and perform breast exams, mammograms, and pelvic exams at regular intervals.
- Avoid pregnancy: This is very important . Avoid getting pregnant completely while taking this medicine and for 2 months after stopping it. There is a possibility of serious harm to the unborn baby. So talk to your doctor about suitable birth control.
- Avoid breastfeeding: Avoid breastfeeding your baby while taking this medicine and for 3 months after stopping it.
- Fertility: This medication may affect fertility in some women. If you have any concerns about this, talk to your doctor about it.
Let's learn about side effects.
Like any medication, Tamoxifen can have side effects. But not everyone gets them. Some are serious, while others are common. The important thing is to be aware of them and take action quickly if needed.
| Go to your doctor or the hospital's Emergency Department (ETU) immediately. | |
|---|---|
| Allergic reactions | Skin rash, itching, swelling of the face, lips, tongue or throat. |
| Symptoms of a blood clot | Leg pain, swelling or a feeling of warmth, difficulty breathing, chest pain. |
| Symptoms of a stroke | Sudden numbness or weakness in the face, arm, or leg, difficulty speaking, confusion, difficulty walking, headache, change in vision. |
| Symptoms of liver injury | Pain in the upper right side of the stomach, loss of appetite, nausea, yellowing of the skin or eyes, dark urine. |
| Other serious symptoms | After menopause, symptoms of infection such as vaginal bleeding, pelvic pain, unusual bruising or bleeding, fever, and chills. |
| If these persist or are bothersome, tell your doctor. | |
| Hot flashes | Sudden extreme heat. |
| Mood swings | Frequent changes in mood. |
| Vaginal discharge | Vaginal discharge. |
Take-Home Message
- Tamoxifen is a very important drug for breast cancer that works by blocking the hormone estrogen.
- Before starting the medication, tell your doctor about all your medical conditions and all other medications you are taking.
- Take the medicine exactly as prescribed by your doctor, at the right time. Never take two doses at the same time.
- Be aware of serious side effects, such as signs of a blood clot or stroke. If you experience any of these, seek medical advice immediately.
- Avoid getting pregnant while taking this medicine and for 2 months after stopping.
- Regularly attending scheduled tests and appointments with your doctor is essential to your well-being.
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