503 pill — ( Tizanidine hydrochloride )

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Have you ever heard about a pill called the 503 pill ? Or maybe you are wondering and you would want to have the full knowledge about the 503 pill. Whatever the case might be in today’s article we will be going in full details on what the 503 pill is all about. We will discuss the uses, dosages, side effects, and interactions of about 503 pills. So we strongly recommend you to read this whole article to the end for you to have the best knowledge about 503 pills. 

What is 503 pill ? 

The 503 pill is a white, round shaped pill that has an imprint 503 on it. This medicine is actually being manufactured by the company known as Caraco pharmaceuticals laboratories

503 pill contains the active ingredient known as Tizanidine hydrochloride with a strength of 4mg.  Tizanidine is actually a short-acting muscle relaxer medication which works by blocking nerve impulses ( this include pain sensations ) that are being sent to your brain. 

Warnings about 503 pill

503 pill also known as tizanidine is literally a short-acting medication that should only be taken for daily activities that actually require relief from muscle spasticity. When you’re taking medicine such as ; ciprofloxacin or fluvoxamine do not take tizanidine. 

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Why is the 503 pill prescribed?

The 503 pill is being used to relieve spasm as well as Increased muscle tone which is actually caused by multiple sclerosis ( weakness, numbness, and loss of muscle coordination and also different problems that are associated with speech, vision ). 503 pill which is also known as tizanidine Is a class of skeletal muscle relaxant medication ( it relaxes the muscle ). Tizanidine acts by slowing actions in the nervous system ( brain ) to help in allowing muscles to relax. 

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How should the 503 pill be used?

The 503 pill, also known as tizanidine, comes in tablet form and it should be used orally ( by mouth ). It can be taken with or without food 2 – 3 times in a day. However it is best advised for you to r we the prescription label carefully on how to use this medicine properly. You may also consult and ask your doctor or Pharmacist to explain to you on how to take this pill in a rightful way. 

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The 503 pill should be used exactly as directed by a healthcare professional. Do not abuse this medication, so it means you should never take more or less of this medication. 

Tizanidine also has a capsules form, these capsules may be opened and also sprinkled on foods ( soft foods ) for example applesauce. However if you are using the capsules Tizanidine make sure you discuss with your doctor before you open the capsules because effects of the medication when it is being opened can actually be different when it is being swallowed as a whole. 

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Each time your prescription is filled, always make sure you check  capsules or tablets In the bottle and be sure you are given the right product. However if you think you have been given the wrong medication talk to your pharmacist or doctor right away. 

Don’t stop this medication without discussing with your doctor, because when this medicine is stopped suddenly it may lead to a fast heart beat or increased blood pressure and tightness of the muscles. Probably your doctor or Pharmacist may reduce your dose gradually before you eventually stop it. 

What To Do if you forget 503 pill dose 

If your doctor advises you to take 503 pills regularly, always make sure you do not miss a dose. However if you miss your dose do not try to double your dose when it is about to take your next dose whereas, skip any missed dose and follow your normal dosage regimen.

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Side effects of 503 pill 

503 pills may cause side effects, however you must talk to your doctor if you notice any side effects that persist for a long time. 

Side effects for 503 pill includes ; 

1. Dizziness : One of the most common side effects of 503 pills is dizziness. One of the simplest ways to reduce the effect of dizziness is to lay gently and rest for a while. 

2. Nausea and vomiting : Nausea ( feeling like vomiting ) and vomiting may occur when this medicine is being used. 

3. constipation 

4. diarrhea

5. nervousness 

6. sweating

7. increased muscle spasms

8. dry mouth

9. stomach pain

10. rash

11. weakness

12. heartburn

Some side effects of this drug can be so chronic. If you experience any chronic side effects that persist for a long time, make sure you call and inform your doctor as soon as possible. 

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Some chronic side effects that may be experienced includes; 

1. pain in the upper right part of the stomach  

2. hallucinations (  seeing things or hearing voices that do not exist ) 

3. unusual bleeding or bruising

4. unexplained flu-like symptoms

extreme tiredness

5. changes in vision

6. slow heartbeat

7. yellowing of the skin or eyes

Aside from all the side effects that are listed in this article, the 503 pill may also cause some other side effects. However if you experience any unusual side effects or problem while taking this drug do not hesitate to inform your Doctor or Pharmacist about it. You may also send a report to the Food and Drug Administrations ( FDA) >> ) or contact them through a phone call

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Before you start using or taking pill 503 ( Tizanidine ), inform your doctor or Pharmacist if you are actually allergic to Tizanidine or with any other medications. 

If you are taking some antibiotics such as ciprofloxacin or fluvoxamine you have to inform your doctor. Your doctor will probably tell you not to use the 503 pill (Tizanidine ) alongside either of these medications. You have to also tell your doctor or Pharmacist what other prescription medications or non-medications, herbal products, nutritional supplements, vitamins or any other medicines you’re planning to make. 

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You should know that some medications can interact with Tizanidine and that is why you should always let your doctor or Pharmacist know the medications you are about to use while using Tizanidine.  

Make sure you mention any of the following drugs below to your doctor or Pharmacist : amiodarone (Cordarone, Pacerone); acyclovir (Zovirax); dantrolene (Dantrium); cimetidine (Tagamet); famotidine (Pepcid, Pepcid AC); baclofen; diazepam (Valium); clonidine (Catapres, Catapres-TTS); medications used to treat seizures, anxiety, or high blood pressure ; mexiletine (Mexitil); oral contraceptive pills ( used for birth control ).

propafenone (Rythmol); fluoroquinolones which includes levofloxacin (Levaquin), norfloxacin (Noroxin), ofloxacin (Floxin); gemifloxacin (Factive), moxifloxacin (Avelox), ticlopidine (Ticlid); and also sleeping pills and sedatives which includes verapamil (Calan, tranquilizers; Covera, Isoptin, zileuton (Zyflo). 

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It might be needed to monitor you carefully for side effects or even change your doses of your medications. For the fact that Tizanidine can interact with other medications so it is advised to tell your doctor you’re taking while you are using 503 pill, even those that do not actually appear on the list we have listed. If you have ever experienced kidney or liver disease, make sure you discuss it with your doctor.

 If you are also pregnant, or you plan to get pregnant or if you are breastfeeding make sure you let your doctor know all this. 

Also if you are having surgery, let the doctor know you are taking Tizanidine. You should also know that this 503 pill has drowsy effects. So it is very important for you not to drive while you’re on this medication. Also machinery operation could be dangerous while you are on this medication. 

Do not drive a car or operate machinery while taking this medication. Also remember that alcohol can add to the drowsiness caused by this medication. This medicine can also cause lightheadedness, dizziness, and fainting when you get up quickly from a lying position. 

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And usually these side effects are more common when you begin your medications. So to avoid this problem, get up from bed slowly, rest a little when you sit then get up gently. Tazanidine can actually decrease muscle tone, so you have to be very careful when you are walking or doing some other activities to help keep your posture or balance. 


503 pill
503 pill

The 503 pill should be kept appropriately in the container, the container should be tightly closed. This medicine should be kept from children’s reach. It should also be stored at a room temperature, it should be kept away from excess heat and moisture. 

Medications that are not needed should always be disposed of in special ways and ensure that children, pets, cannot consume them mistakenly. It is always advisable not to dispose of medications in the toilet whereas you can dispose of unneeded medications through the Medicine take-back program. 

You can discuss with your doctor or Pharmacist to learn more about the take-back programs in your community. It is always advisable to keep all medicines away from children’s reach. To avoid and prevent young children from poisoning, always make sure you keep all medicine in a safe place. 

If anyone should abuse this medication or overdose this medicine, contact the poison control helpline at >> 1-800-222-1222 . You can also visit their website at >> for more information. However if the victim had a seizure, trouble breathing, collapsed then call the emergency service at 911 immediately. 

There are some symptoms that will be shown when a victim used the overdose of 503 pill these symptoms includes ; 

slow or shallow breathing


extreme tiredness


loss of consciousness



slow heartbeat

All your appointments must be kept with your doctor and the laboratory. 

Certain lab tests  will be conducted to check your response to Tizanidine. Always ask your Pharmacist questions you have about refilling your prescription, and never allow anyone else to take your medication. 

Always keep a written list of all the prescription or nonprescription ( medicine you can get without a doctor’s prescription ) medicines you are taking including supplements and multivitamins. You should bring all this list alongside with you Every Time you visit your doctor or if you are actually being admitted to a hospital. These list is a vital information that will be needed, for an instance it’s an information that might be needed in case of emergencies. 

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Brand Name Of 503 pill ? 

Zanaflex® is a brand name of 503 pills. 

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