Zithromax is a powerful antibiotic that doctors prescribe to help patients recover from a series of bacterial infections. The antibiotic comes in various forms outside of the traditional pill.

In this article, we laid out all the facts for you including Zithromax dosage information, side effects, and the infections it treats. Read until the end to make sure you’ve got all the information you need.

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What Is Zithromax?

Zithromax, also known by its generic name azithromycin is a macrolide-type antibiotic. Antibiotics that fall into this class stop the growth of bacteria within the body. Because of this functionality, are usually prescribed to treat bacterial infections.

Zithromax can be prescribed in various formats such as:

  • An eyedrop
  • An oral tablet
  • Oral suspension
  • Extended-release oral suspension
  • Intravenously administered by a doctor

Doctors will use Zithromax to treat dozens of infections, including the following:

  • Lyme disease
  • Traveler’s diarrhea
  • Middle ear infections
  • Gonorrhea in the throat
  • AIDS with toxoplasmosis
  • Strep throat and tonsillitis
  • Bacterial infections in the heart valve

Keep in mind that this medication cannot treat viral infections like the flu or common colds. If this or any other antibiotic is misused, it won’t be effective.

Zithromax Dosage & Usage Instructions

Zithromax comes in varying dosages. The amount that’s prescribed will always vary from patient to patient. Factors like the form you’re taking the drug in and the illness it’s treating can impact your dosage.

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Here are some examples:

Tablet Dosages

The tablet form of Zithromax comes in 250 mg, 500 mg, and 600 mg.


A packet or Zpack of Zithromax only comes in a 1g dose.

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Suspension Reconstituted

Suspension dosages are usually prescribed for children. They come in two sizes:

  1. 100 mg
  2. 200 mg

Powder for Solution

The powder form is also prescribed to children but can be prescribed to adults too.

It can come in:

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  • 500 mg
  • 2.5 g

Because this drug can be used to treat so many ailments at various levels, there isn’t a one size fits all dosage amount. Never use Zithromax that was prescribed to a different person. Also, never give it to a child without a doctor’s prescription.

Your doctor will tell you exactly how much Zithromax is safe for you. The dosage will also be dependent on the way your body responds to treatment.

How to Use Zithromax

Zithromax should be taken orally (unless it was prescribed to you in another form) according to your doctor’s instructions. However, the average person will have to take it once per day.

This medication can be taken with or without food. Some patients have recorded having an upset stomach while taking Zithromax. If this is you, try to eat a little something prior to taking the pill.

For the best results, you should take Zithromax at evenly spaced times every day. Setting an alarm for the same time each day can help you remember to take your pill. It isn’t more or less effective at different times during the day.

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If you miss a dose, take the missed pill as soon as you remember unless is close to the time of your next dosage. Don’t double up on pills to compensate for a missed one.

As with most antibiotics, your symptoms will begin to clear within a few days of taking Zithromax. This doesn’t mean you should stop taking the medication.

If you stop taking it too early, your infection could return. The bacteria will continue to grow without Zithromax in your system.

Side Effects

Not every patient who takes Zithromax will encounter the same side effects. You may not have any at all.

Common side effects are still worth noting though. Some of them include:


  • Nausea
  • Vomiting
  • Abdominal pain
  • An upset stomach
  • Loose stools or diarrhea

Less common, more serious side effects include:

  • Yellowing eyes and skin
  • Decreased hearing or deafness
  • Difficulty speaking or swallowing
  • Drooping eyelids or blurred vision
  • Unusual tiredness (sign of a liver problem)

Alert your doctor right away if you experience any of these unusual side effects.

Drug Interactions and Precautions

You shouldn’t ever use Zithromax if you have an azithromycin allergy. Or if you’re allergic to similar medications like clarithromycin and erythromycin.

It also isn’t safe for patients who’ve had jaundice or liver problems caused by Zithromax to take it again.

So that you are completely sure about whether Zithromax will work well with your body, tell your doctor if you’ve ever had:

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  • Liver disease
  • Kidney disease
  • Low potassium levels
  • A heart rhythm disorder
  • Long QT syndrome (or if it runs in your family)

Zithromax isn’t known to harm unborn babies or pass through breast milk. Let your doctor know if you’re pregnant or plan on becoming pregnant before you take Zithromax.

Drug Interactions

Drug interactions can possibly change the effectiveness of your medications. They can also increase your risks of harmful side effects.

When combined with these medications, the interactions can become dangerous:

  • Bepridil
  • Sertindole
  • Telavancin
  • Hydroxyzine
  • Amifampridine
  • Live typhoid vaccine

These drugs aren’t typically taken by patients who use Zithromax. But to cover all your bases, tell your doctor about all the medications you use before you begin taking this or any other antibiotic.

You should include prescription, nonprescription, and herbal products.

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