Have you ever heard of a medicine that doctors keep as a special backup plan? Sometimes, strong germs called bacteria can cause infections in your body. When regular germ-killing medicines, known as antibiotics, fail to work, doctors reach for something much stronger.
One of those powerful backup medicines is called Colistin, which doctors also know as colistimethate sodium or polymyxin E. This guide will walk you through everything you need to know about this medicine in plain, simple English.
Let us explore how this medicine works, why doctors use it, and what you should watch out for during your treatment.
Key Takeaways
- Last-Resort Medicine: Colistin is a very strong antibiotic used only for severe bacterial infections that resist other drugs.
- Hospital Use: Doctors usually give this medicine as an injection inside a hospital setting rather than as a pill at home.
- Kidney Safety: Your doctor must check your kidney health carefully because this medicine can affect your kidneys.
- Complete the Course: Always finish your full treatment plan even if you start feeling better.
Know your body mass index (BMI) and weight classification
What Kind of Medicine Is Colistin?
Simply put, Colistin belongs to a family of medicines called polymyxins. Its main job is to hunt down and destroy very tough bacteria that have invaded your body.
The most important thing to keep in mind is that doctors give this medicine only for bacterial infections. It will not help you feel better if you have a viral infection like a common cold, a cough, or the flu.
Think of this medicine as a special, heavy-duty tool that doctors use only when standard tools fail. Because it is so strong, doctors do not use it for everyday sicknesses.
Things to Tell Your Doctor Before Starting This Medicine
If your doctor decides that you or a loved one needs Colistin, you must share your complete health history. Do not hide anything, because being open helps keep you safe during your treatment.
- Kidney Problems: Tell your doctor right away if you have ever had any kidney disease or kidney trouble. This medicine can place stress on your kidneys, so your doctor needs to know.
- Lung Conditions: Let your doctor know if you suffer from asthma or any other breathing problems.
- Myasthenia Gravis: This is a rare muscle weakness disease. You must tell your doctor if you have this condition.
- Allergies: Mention if you are allergic to Colistin, Polymyxin B, or any other foods, dyes, or medicines.
- Pregnancy: Tell your doctor if you are pregnant or plan to become pregnant soon.
- Breastfeeding: Let your doctor know if you are currently nursing a baby.
How Do Doctors Use This Medicine?
Unlike regular pills you can take at home, Colistin is an injection. You will not find it as a simple tablet at your local pharmacy.
Most of the time, a doctor or a trained nurse will give you this medicine inside a hospital or clinic. They will inject it directly into a muscle or straight into a vein through an IV line.
In rare cases, if you need to continue this treatment after leaving the hospital, your care team will teach you how to do it safely. If that happens, follow their instructions carefully and take the exact dose at the right time.
Never stop taking your medicine just because you feel better, and do not skip any doses. Finish the full treatment plan for as many days as your doctor ordered.
If You Use Injections at Home
If your doctor sends you home with injections, you must handle your medical supplies with great care. Never throw used needles and syringes into a normal household trash bin, because someone could get hurt.
Always place used needles into a special container called a sharps container. If you do not have one, ask your doctor or pharmacist where you can get a safe disposal container.
What Are the Side Effects of This Medicine?
Like many strong medicines, Colistin can cause side effects in some people. Some of these effects need quick medical attention from your care team.
The table below breaks down the side effects you should watch for and what you should do.
| Side Effect Type | Description and What You Should Do |
|---|---|
| Call Your Doctor Right Away for These Serious Signs | |
| Severe Allergic Reactions | Skin rash, heavy itching, or swelling of your face, lips, tongue, or throat. This is a medical emergency. |
| Trouble Breathing | Finding it hard to breathe or feeling like your chest is tight and you are choking. |
| Kidney Strain | Trouble passing urine, peeing much less or much more than usual, or noticing a change in urine color. |
| Nerve System Signs | Feeling confused, very dizzy, losing your balance, numbness in your hands or feet, or trouble speaking clearly. |
| Severe Diarrhea | Having watery stools or diarrhea with blood in it. |
| Fever | Developing a new fever on top of your existing infection. |
| Tell Your Doctor If These Signs Do Not Go Away | |
| Feeling Anxious | Feeling restless, nervous, or uneasy in your mind. |
| Extreme Tiredness | Feeling much more tired and worn out than usual. |
What Else Should You Watch Out For?
- Drowsiness and Dizziness: This medicine can make you feel sleepy or dizzy. Do not drive a car, operate heavy machines, or do tasks that need sharp focus until you know how the medicine affects you. If you are an older adult, stand up and sit down slowly to prevent falls caused by dizziness.
- Other Medicines: Tell your doctor about every medicine, vitamin, or herbal product you take. Certain drugs, such as other antibiotics like amikacin or gentamicin, or muscle relaxants used before surgery, can react badly with Colistin.
- Diarrhea Management: If you get diarrhea, do not try to treat it yourself with store-bought pills. If your diarrhea lasts for more than two days or becomes watery and severe, talk to your doctor right away.
- Accidental Overdose: If you think you took more medicine than your doctor prescribed, call your local emergency services right away (such as 911 in the US/Canada, 999 in the UK, or visit your nearest Emergency Department).
Emergency Red Flags: When to Seek Immediate Help
Seek emergency medical care right away by calling 911, 999, or going to the nearest Emergency Room if you experience sudden trouble breathing, swelling of your face and lips, severe chest tightness, sudden confusion, or total inability to pass urine. Quick action can save a life.
💡 Take-Home Message
- Colistin is a powerful injection used only for severe bacterial infections that do not respond to regular antibiotics.
- Before starting treatment, tell your doctor about all your medical conditions, especially kidney problems and current medicines.
- Take your full prescribed course of treatment without missing a single dose.
- Report any breathing trouble, urine changes, severe dizziness, or allergic reactions to your doctor right away.
- Avoid driving or using machinery while taking this medicine if it makes you feel sleepy or dizzy.
- Talk openly with your doctor or nurse if you have any questions or worries about your care.
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