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Generic name: Macrolides (Mac-roem-ye-sin)

Drug class: Macrolides

What is Ery Tab?

Ery-Tab, also known as Erythromycin, is a delayed-release tablet that contains 250 mg, 500 mg, or 333 mg of Erythromycin. Erythromycin is a member of a class of antibiotics called macrolides. Macrolide antibiotics reduce the production of proteins that are needed by sensitive bacteria in order to survive.Ery-Tab can be used to treat and prevent a wide range of bacteria-caused infections.Ery-Tab can be used in other ways not mentioned in this guide.

Side effects of Ery-Tab

If you experience any of the following symptoms: hives, difficulty breathing, swelling on your face or in your throat, or severe skin reactions (fever or sore throat with burning eyes, skin pain or blistering, or red or purple rash),

If you experience:

  • Severe stomach pain or diarrhea that is bloody or watery (even months after the last dose);
  • Headache with severe chest pain, dizziness, and fainting; fast or pounding pulse beats
  • A seizure
  • Hearing problems (rare);
  • Pancreatitis: severe pain that spreads to your back and upper stomach; nausea, vomiting, or
  • Liver problems: loss of appetite (upper right), stomach pain, fatigue, easy bleeding or bruising, dark urine or clay-colored stool, jaundice

Older adults are more likely to experience serious side effects, such as hearing loss or a dangerously fast heartbeat.If your baby is irritable or vomiting after taking this medication, call your doctor.

Ery-Tab may cause side effects such as:

  • Severe stomach pain or diarrhea that is bloody or watery (even months after the last dose);
  • Liver problems
  • Abnormal liver function tests

There may be other side effects. For medical advice on side effects, call your doctor. The FDA can be contacted at 1-800-FDA-1088 to report side effects.


Ery-Tab can interact with some medicines that may cause harmful or unwanted effects. If you are taking cisapride or pimozide and ergotamine or dihydroergotamine, your doctor may have to alter your treatment plan.Tell your doctor before taking Ery-Tab if you suffer from liver disease, myasthenia gravis, heart rhythm disorders, a Long QT syndrome history, or low potassium or magnesium levels in your blood.Ery-Tab should be taken for the entire prescribed time. You may experience symptoms before the infection has completely cleared. You may increase your chances of a second infection resistant to antibiotics if you skip doses. Erythromycin does not treat viral infections such as the flu or the common cold.Antibiotics can cause diarrhea. This could be an indication of a new illness. Ery-Tab should be stopped if you experience diarrhea that is bloody or watery. Call your doctor. You should only use anti-diarrhea medication if your doctor has prescribed it.

Before you take this drug

If you have an allergy to erythromycin, Ery-Tab should be avoided.

Certain medicines can have unwanted or harmful effects when combined with erythromycin. If you are also taking

  • Lovastatin, simvastatin;
  • Cisapride;
  • Pimozide;
  • Ergotamine, or dihydroergotamine.

Inform your physician of any of the following issues:

  • Liver or kidney disease
  • Myasthenia gravis;
  • A heart rhythm disorder, especially if you are taking medicine to treat it;
  • Long-QT syndrome
  • An electrolyte imbalance can occur when there is a low level of magnesium or potassium in the blood.

The safety of erythromycin for an unborn child is unknown.Inform your doctor immediately if you are pregnant or planning on becoming pregnant.You may not be able to breastfeed while Ery-Tab is being used. You should consult your doctor if you are concerned about any risks.

Similar/related drugs

Prednisone, Amoxicillin, Doxycycline, Ciprofloxacin, Cephalexin, Azthromycin, and Metronidazole

How to take Ery-Tab?

Follow the instructions on your prescription label and read all medication guides or instruction sheets. Read all the instructions and directions that come with your prescription. Sometimes, your doctor will change the dose. You must take the medication exactly as prescribed.Please read and follow all instructions for use that come with your medication. Ery-Tab should not be used if you do not understand the instructions. If you have any questions, ask your pharmacist or doctor.Avoid crushing, chewing, or breaking an Ery-Tab. Swallow the whole tablet.Even if you feel better quickly, continue to take this medication for the entire prescribed time. You can get an infection resistant to the medication if you skip doses. Erythromycin does not treat a virus, such as the flu or a cold.It can also affect certain medical tests. Tell your doctor that you use erythromycin.Store away from moisture, heat, and light at room temperature.

What happens if I miss the dose?

If your next dose is nearly due, don't take one that was missed. Never take two doses of the same medicine at once.

What happens if I overdose?

Call 1-800-222-1222 for poison help or seek immediate medical attention.

Avoid this

Diarrhea can be caused by antibiotics. This could indicate a new infection. Call your doctor if you have bloody or watery diarrhea before taking anti-diarrhea medication.

Interaction with other drug

It is sometimes not safe to take certain medications together. Some drugs may affect the blood levels of drugs that you are taking, causing side effects or making them less effective.Many drugs interact with erythromycin and should not be taken together. Inform your doctor of all the medicines you are taking, as well as any new ones. Included are prescription and over-the-counter medicines, vitamins, and herbal products. This list does not include all possible interactions.



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