<Li> Hypersensitivity to clarithromycin or any component of the product, erythromycin, or any macrolide antibiotics . </Li> <Li> QT prolongation or ventricular cardiac arrhythmias, including torsade de pointes . </Li> <P> The most common side effects are gastrointestinal: diarrhea (3%), nausea (3%), abdominal pain (3%), and vomiting (6%). It also can cause headaches, insomnia, and abnormal liver function tests . Allergic reactions include rashes and anaphylaxis . Less common side effects (<1%) include extreme irritability, hallucinations (auditory and visual), dizziness / motion sickness, and alteration in senses of smell and taste, including a metallic taste . Dry mouth, panic attacks, and nightmares have also been reported, albeit less frequently . </P> <P> Clarithromycin can lead to a prolonged QT interval . In patients with long QT syndrome, cardiac disease, or patients taking other QT - prolonging medications, this can increase risk for life - threatening arrhythmias . </P>

Does clarithromycin cause a bad taste in the mouth