Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. If you took just one time a second dose there is nothing to be worried about it. If you have symptoms like : -vomiting, -feeling exhausted or short of breath, -blurred vision, -watery eyes, -trouble walking, and blood in your stools or vomit. you should consult doctor. Hope I have answered your query. Let me know if I can assist you further.