Zithromax has been shown to cause some side effects. Talk to your health care provider if these mild reactions do not go away within a few days.
Common side effects reported from Zithromax use include:
- Nausea
- Stomach pain
- Diarrhea
- Vomiting
- Headaches
This is not a complete list of adverse effects – though these are among the most common. Seek medical attention right away if you experience any of the following symptoms while taking Zithromax:
- Changes in heartbeat
- Confusion/ dizziness
- Fainting
- Skin rash
- Hives
- Itching
- Difficulty breathing or swallowing
- Swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs
- Watery or bloody stool
- Yellowing of the skin or eyes
- Extreme fatigue
- Unusual bleeding or bruising
- Lack of energy
- Abdominal pain
- Flu-like symptoms
- Muscle weakness
As with all prescription medication, be sure to inform the prescribing doctor about any medical conditions you have been previously diagnosed with and any medication/ supplements you are currently taking before starting treatment with Zithromax.
Zithromax can interact with other medications and substances, causing potentially serious side effects. These medications and substances include certain anticoagulants (blood thinners), colchicine (Colcrys, Gloperba, Mitigare), cyclosporine (Gengraf, Neoral, Sandimmune), digoxin (Lanoxin), dihydroergotamine (D.H.E. 45, Migranal, Trudhesa); ergotamine (Ergomar, in Migergot), medications for irregular heartbeat such as amiodarone (Nexterone, Pacerone), dofetilide (Tikosyn), procainamide, quinidine, and sotalol (Betapace, Sorine, Sotylize), nelfinavir (Viracept), and phenytoin (Dilantin, Phenytek).
Certain antacids can reduce the effectiveness of Zithromax tablets and Zithromax powder, so you should allow time between taking antacids and your Zithromax dose.
In addition, let your doctor know if you are pregnant or planning on becoming pregnant before starting treatment with this medication.