After 3 months, my son was 90% back to his old self. However, 8 months after taking the Azithromycin - he started complaining that he feels that it is damaging his heart. He feels that his heart is working too hard and that he lacks stamina. It turns out that Azithromycin has been linked to cardiac complications (google). I switched him to Augmentin and his compulsions/OCD were back within the week.Has anyone else experienced heart problems on the Zith?