Has your doctor told you or someone close to you that you are going to start taking a medicine called Foscarnet? Or have you ever wondered about this medicine? This medicine is not something you usually buy from a pharmacy and use at home. This is a special medicine that is given in a hospital, under medical supervision. So today, let's talk briefly about this medicine called Foscarnet.
What is Foscarnet?
Simply put, Foscarnet is an antiviral drug . It works by controlling and stopping the spread of certain viruses that enter our bodies and cause disease.
This medicine is often used to treat or prevent herpes virus infections and cytomegalovirus (CMV) infections. This is especially important in people with weakened immune systems (such as those with HIV or transplant recipients), as CMV can cause serious damage to the eyes (retinitis) or other organs. This medicine is especially important in such cases.
The important thing is, this is not a medicine for the common cold. This is a medicine that is given intravenously (infusion) for serious viral infections in the hospital, under the close supervision of doctors and nurses.
Things you need to tell your doctor before starting medication
Before you start treatment with Foscarnet, it is extremely important to inform your doctor about your complete health history, as some health conditions require special care when using this medication.
If you have any of the following conditions, be sure to tell your doctor.
| Health status | Why is awareness important? (Simply) |
|---|---|
| Kidney disease | This medicine is eliminated from the body through the kidneys. If the kidneys are weak, the medicine may accumulate in the body and increase the side effects. |
| Heart disease | This medicine can sometimes cause heart rate abnormalities. |
| Low blood levels of calcium, magnesium, phosphorus, or potassium | Foscarnet can cause further changes in these mineral levels, so it is important to be aware of this in advance. |
| Seizures | There is a rare risk of seizures with this medication. |
| Low blood counts | The doctor should be aware of any low white blood cell, red blood cell, or platelet count. |
| Being pregnant or planning to be pregnant/breastfeeding | Since the safety of this medicine has not been established during pregnancy and breastfeeding, it is essential to tell your doctor about this. |
| Allergies to other medications | If you have an allergy to Foscarnet or any other medicine, food, or dye, please let us know. |
What if I take too much medicine?
This is given in a hospital setting, so the chances of this happening are very low. However, if you suspect that you have taken too much of the medicine, you should inform the medical staff immediately. Alternatively, call the National Poisons Information Centre at the Colombo National Hospital . In an emergency, it is important to go to the Emergency Treatment Unit (ETU) of the nearest hospital.
Interactions with other drugs
Foscarnet is a medication that can interact with other medications. Therefore, tell your doctor about all the medications you are taking (prescribed, over-the-counter, traditional medicines, vitamins, herbal products).
Foscarnet should never be used together with the following medications.
- Cidofovir
- Cisapride
- Dronedarone
- Pimozide
- Thioridazine
In addition, it can interact with many other medications. For example:
- Other medications that can affect the kidneys (e.g. Amphotericin B, Gentamicin, NSAIDs painkillers)
- Medications that affect the heart rate (drugs that prolong the QT interval)
- Other antivirals (such as Acyclovir, Ganciclovir)
- Diuretics
- Aspirin
This list is not complete. Therefore, it is safest to give your doctor a complete list by saying, "I am taking this medication."
Things to consider during treatment
- Scheduled Tests: Go to your doctor on the scheduled dates as prescribed. Your blood mineral levels, kidney function, and blood cell count will need to be checked regularly. Don't skip these tests.
- Dehydration: Tell your doctor or nurse if you have severe diarrhea, nausea, or vomiting, or if you are sweating a lot. Dehydration can be dangerous while taking this medicine.
- Numbness: If you experience numbness or tingling in your mouth, lips, hands, or feet, tell your doctor or nurse right away . This can be a serious sign of low blood calcium levels.
- Dizziness and drowsiness: This medicine may make you feel a little drowsy or dizzy. Therefore, avoid activities that require alertness, such as driving or operating machinery, until you know how the medicine affects you. Especially if you are an elderly person, do not get up suddenly from a sitting or standing position. This can reduce the risk of dizziness and falls.
Side effects of the medicine
Like any medicine, Foscarnet can cause side effects. Some are serious, while others are common.
| Side effects that should be reported to the doctor/nurse immediately | |
|---|---|
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| Things that are usually not serious, but should be reported to the doctor if they persist | |
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Take-Home Message
- Foscarnet is a powerful drug given intravenously in a hospital for serious viral infections.
- Before starting treatment, it is essential to tell your doctor about all medical conditions you have and all medications you are taking.
- If you experience any serious side effects during treatment, such as numbness in the limbs, difficulty breathing, or changes in heart rate, notify the medical staff immediately.
- Do not skip the scheduled blood tests and other tests prescribed by your doctor.
- If you have any questions about this medication, don't be afraid to talk openly with your doctor about it.
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