I've just found something on line which says this antibiotic shouldn't be handed out to people with hypothyroidism. I think it was a Canadian web-site. But there is nothing in the PIL that mentions hypothyroid contraindications.? I feel dreadful tonight. Very hypo. Having been taking this for 5 days now. I know that metronidazole can make one feel bad anyway but I do feel Massively hypo now.