It's normal to feel a little scared and nervous when you or a loved one begins treatment for cancer. That fear can be heightened, especially when you hear the word 'chemotherapy'. But don't be scared at all. To make this treatment process successful, we must first be well informed about this medication. Then we can face this journey well. Today we are talking about one such anti-cancer drug, Thioguanine (6-TG).
What kind of medicine is Thioguanine (6-TG)?
Simply put, Thioguanine is an anti-cancer drug . Doctors call it a 'chemotherapy' drug. Its main function is to stop the growth of rapidly dividing cancer cells in the body and destroy them.
This medicine is used specifically to treat certain types of leukemia , which are cancers of the blood cells. Sometimes, your doctor may also prescribe this medicine for other conditions. So if you have any questions about why you have been given this medicine, it is best to ask your doctor.
Things you need to tell your doctor before starting medication
Before starting Thioguanine treatment, it is very important to inform your doctor about your complete health history. Because we need to be very careful when using this medicine with certain health conditions. If you have any of the following, be sure to tell us about it.
| Health condition/fact | Why should you inform the doctor? |
|---|---|
| Current infections (especially viral ones like chickenpox and herpes) | Because this medicine reduces the body's immunity, existing infections may become worse. |
| Liver disease | Because this medication is processed by the liver, it may have side effects in liver disease. |
| Decreased blood cell count (white blood cells, red blood cells, platelets) | Thioguanine can further reduce blood cell production, which can be dangerous if your blood cell count is already low. |
| TPMT deficiency (Thiopurine methyltransferase deficiency) | This is a genetic condition. People who lack this enzyme may have a buildup of Thioguanine in their body, increasing the side effects. |
| Allergies | It is essential to inform your doctor if you have any allergies to Thioguanine or other medications or foods. |
| Trying to conceive, being pregnant, or breastfeeding | This medication can cause serious harm to the unborn baby, so it's important to talk about it. |
How should I use the medicine?
The method of using this medicine is very simple, but very important.
- Swallow the pill with a glass of water , as directed on your prescription.
- Take your medicine every day, exactly as your doctor tells you, at the time you are told. Don't skip appointments.
- Do not stop taking the medication or change the dosage for any reason without your doctor's advice.
- If you are giving this medicine to children, talk to your pediatrician about it and follow their instructions.
Attention: If you think you have taken more medicine than prescribed, do not delay. Immediately call the National Poisons Information Centre at the Colombo National Hospital or go to the Emergency Department (ETU) of the nearest hospital.
What to do if you miss a dose of medication?
If you miss a dose, don't worry. Skip the missed dose and take the next dose at the scheduled time. Never take two doses at once. That means don't take a double dose to make up for a forgotten dose. If you vomit after taking the medication, ask your doctor for advice on what to do next.
Other medications that may interact with this medicine
It is very important to tell your doctor about all the medications you are taking, including prescription medications, over-the-counter medications, vitamins, herbal remedies, and even supplements. Some medications can interact with Thioguanine and increase side effects or change how well it works.
Be especially careful with the following medications:
- Busulfan (another anticancer drug)
- Medications that prevent blood clotting (e.g. Warfarin)
- Medicines to increase blood cell count (e.g. filgrastim)
- Drugs like Mesalamine, Olsalazine, Sulfasalazine, Balsalazide
- Vaccines of any kind
Special warning: Do not take over-the-counter pain relievers such as aspirin, acetaminophen, and ibuprofen without consulting your doctor. These medications can suppress symptoms such as fever. It is important to recognize fever early, as it can be an early sign of an infection when taking Thioguanine.
Things to consider when undergoing treatment
Since chemotherapy affects both cancer cells and healthy cells, it is normal to feel uncomfortable and lethargic. However, do not stop treatment until your doctor tells you to because of these discomforts.
- Protect yourself from infections: This medicine lowers your immunity, so you are more likely to get sick. Therefore, avoid going to crowded places and being in contact with sick people (those with fever or cold) as much as possible. If you experience symptoms such as fever, cold, sore throat, or body aches , do not self-medicate and tell your doctor immediately.
- Be careful about bleeding: The risk of bleeding may increase. So, brush your teeth gently. Do not use hard brushes. Check for any bruises or small red spots on the skin. If you see anything like that, inform your doctor.
- Avoid pregnancy: This is very important. Avoid getting pregnant completely while taking this medication. Also, avoid breastfeeding while taking this medication. Ask your doctor for more information about this.
What are the most common side effects?
Like any medicine, Thioguanine can cause side effects. But not everyone gets them. Some are very common, and some are very rare. The important thing is to know what the side effects are and what to do if they occur.
| Thioguanine (6-TG) side effects | |
|---|---|
| 🚨 Side effects that require immediate medical attention | |
| Allergy symptoms | Skin rash, itching, swelling of the face, lips, tongue, difficulty breathing. |
| Signs of infection | Fever, chills, cough, sore throat, pain when urinating. |
| Bleeding symptoms | Unexplained bruising of the skin, pinpoint red spots under the skin, black stools, and blood in the urine. |
| Symptoms of anemia | Unusual tiredness, lethargy, dizziness, blue eyes. |
| Liver problems | Pain in the upper right side of the stomach, yellowing of the eyes or skin (jaundice). |
| Other serious symptoms | Mouth sores, swelling of the ankles, feet or abdomen, sudden weight gain. |
| 🙂 Side effects that should be reported to the doctor if they persist | |
| Digestive system problems | Diarrhea, loss of appetite, nausea, vomiting. |
How to store medicine properly?
- Keep it in a safe place out of the reach of children.
- Store in a dry place at room temperature (between 15 and 25 degrees Celsius).
- Protect from moisture. So keep the medicine bottle tightly closed.
- Discard any medication that has passed its expiration date.
Take-Home Message
- Thioguanine is a chemotherapy drug used to treat cancers such as leukemia.
- Always take your medicine exactly as prescribed by your doctor, at the right time.
- Tell your doctor about all other medications, vitamins, and traditional medicines you are taking.
- If you notice signs of infection or bleeding, such as fever, bruising, or bruising, notify your doctor immediately.
- Completely avoid pregnancy and breastfeeding while taking this medicine.
- Never stop treatment or change the dosage without medical advice.
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