Azithromycin, the antibiotic in Z-packs, can cause several side effects, though many people tolerate it well. These effects typically range from mild to moderate and usually resolve once you finish the medication. However, you should contact your doctor if they persist or worsen.
Gastrointestinal Issues
The most frequently reported side effects involve the digestive system. These include nausea, diarrhea, vomiting, and abdominal pain. These symptoms usually aren’t severe but can be uncomfortable. Staying hydrated is key to managing diarrhea. If vomiting is persistent or severe, contact your doctor immediately. Consider bland foods like toast and broth if nausea occurs.
Other Potential Side Effects
Beyond digestive problems, some individuals experience less common reactions. These can include headache, dizziness, skin rash, and vaginal yeast infections (in women). Less frequently, people report changes in taste and a metallic taste in their mouth. If you develop a severe allergic reaction like difficulty breathing or swelling of your face, seek immediate medical attention.
Severity and Duration
| Nausea | Common | Lasts the duration of treatment or shortly thereafter. |
| Diarrhea | Common | Usually resolves within a few days of completing the course. |
| Headache | Less common | Often subsides on its own. |
| Rash | Uncommon | Requires immediate medical attention if severe. |
When to Call Your Doctor
Contact your physician if you experience severe or persistent side effects, experience symptoms not listed here, or if your symptoms don’t improve after completing the course of antibiotics.
