Has your doctor prescribed you or someone you know a pill called Guanidine? You may be a little curious, or even a little scared, when you hear this name. Because this is not a medicine we often hear about. Guanidine is a medicine that is used to treat a very specific and rare medical condition. Therefore, it is very important to be aware of this. So, today we will talk about these Guanidine pills, the medical conditions they treat, how to use them, and the things to be careful about.
What is Guanidine and what disease does it treat?
Simply put, Guanidine is a drug that stimulates nerves and improves muscle function. Medically speaking, it belongs to the class of drugs called `cholinergic muscle stimulants`.
This drug is mainly used to treat a rare autoimmune condition called Lambert-Eaton Myasthenic Syndrome (LEMS) .
Let's understand a little about what LEMS is.
Imagine, our body's movements are controlled by messages from the brain. When these messages travel through the nerves and reach the muscles, we are able to move our arms and legs and walk. At the point where a nerve and a muscle meet, a chemical called `Acetylcholine` is released from the nerve endings. When this chemical reaches the muscle, the muscle contracts, that is, it works.
But in a person with LEMS, the body's immune system mistakenly attacks those nerve endings. As a result, the amount of `Acetylcholine` needed is not released. The result is severe weakness and fatigue caused by the muscles not receiving the message properly. Muscle weakness is especially common in the legs and hips.
Guanidine works by stimulating the release of the chemical messenger (Acetylcholine) from nerve endings. This means it gives a boost to the blocked message flow and helps the muscles function properly again.
Things you need to tell your doctor before starting medication
Guanidine is a drug that should be used with caution. Therefore, it is very important to inform your doctor about your complete medical history before prescribing this medication. Be sure to tell them if you have any of the following conditions:
- Kidney disease: You should tell your doctor if you have any kidney-related conditions, as the kidneys play a major role in eliminating this medication from the body.
- Liver disease: If there is any weakness in liver function, also mention it.
- Blood cell problems: If you have been reported to have low white blood cells, red blood cells, or platelets in your blood, that is very important information.
- Mental Illness: If you are being treated for or have a history of any mental illness, please inform us.
- Allergies: If you are allergic to guanidine or any other medicine, food, or dye.
- Pregnancy or expecting a baby: If you are pregnant or planning to become pregnant, this is a must-mention.
- Breastfeeding: Also inform the doctor if you are a breastfeeding mother.
How should I use this medicine?
The most important thing is to follow your doctor's instructions exactly when using this medicine.
- Swallow this pill with a glass of water.
- Use the medicine exactly as directed on the prescription label. Do not take more or less than the amount your doctor tells you to take.
- This can be taken before or after meals. However, if you experience stomach upset, taking it with food may help reduce it.
- Get into the habit of taking your medicine at the same time every day, on time.
- Most importantly: Do not stop taking your medication for any reason without your doctor's advice. Stopping suddenly can cause your symptoms to return and become worse.
- If given to children: When giving this medicine to children, it is essential to consult a pediatrician.
What if I take too much medicine? (Overdose)
If you think you may have accidentally taken more medicine than you think, don't delay. Immediately call the National Poisons Information Centre at the Colombo National Hospital , or go to the Emergency Treatment Unit (ETU) of the nearest hospital.
Let's also learn about side effects and interactions.
Like any medicine, Guanidine can cause side effects. It can also interact with other medications.
Possible side effects
Some of these can be serious, some are common. It's important to be aware of these.
| Type of side effect | Characteristics |
|---|---|
| Serious side effects that require immediate medical attention | |
| Allergic reactions | Skin irritation, itching, swelling |
| Breathing difficulties | Difficulty breathing |
| Changes in heart rate | Fast or irregular heartbeat |
| Signs of infection | Fever, sore throat |
| Mental changes | Seeing or hearing things that are not real (Hallucinations) |
| Urinary problems | Difficulty urinating or a change in the amount of urine you produce |
| Unusual weakness | Feeling of extreme fatigue and weakness in the body |
| Effects on the liver | Yellowing of the eyes or skin (like jaundice) |
| Common side effects that should be reported to the doctor if they persist | |
| General characteristics | Dry mouth, dizziness, headache, stomach upset, nausea/vomiting, diarrhea, loss of appetite |
| Effects on the nervous system | Numbness, tingling, or pain in the limbs, mood changes |
Other drugs that interact with Guanidine (Drug Interactions)
Other medications you are taking can affect the way Guanidine works. So tell your doctor about all the medications you are taking (including vitamins and herbal products), especially if you are taking any of the following:
- Some medications taken for cancer
- Medications given to control immunity after organ transplantation
- Some medications for seizures (e.g., `Carbamazepine`)
- Medications for mental illness such as ``Clozapine''
- Phenothiazines (e.g. Chlorpromazine)
- Steroid-type medications (e.g. `Prednisone`, `Cortisone`)
- `Sulfinpyrazone`
Keep in mind that this list is not complete, so for your safety, it's best to tell your doctor about everything you're taking.
Take-Home Message
- Guanidine is a drug used to treat a rare, specific neuromuscular disease called Lambert-Eaton Myasthenic Syndrome (LEMS).
- Be sure to inform your doctor about all medications you are taking, especially if you have kidney, liver, or blood problems.
- You should never start, stop, or change the dosage of medication without your doctor's advice.
- If you experience any serious side effects such as difficulty breathing, changes in heart rate, yellowing of the eyes, or fever, seek medical advice immediately.
- If you suspect an overdose, go to the National Poisons Information Centre or the hospital's Emergency Department (ETU) immediately.
- Store the medicine in a safe place at room temperature, out of the reach of children.
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