Hi. Thanks for your query. Noted the history and understood the concerns. Giardiasos is a disease of colon but you have not mentioned the exact symptoms. Anyway, Cifran CT is the drug of choice, if CT stands for tinidazole, please chech the pack that you have or consult the Pharmacist. Continue the medicines for the stipulated period of time. Check the stool again and see the results. It takes time for inflammation to settle hence the need to take symptomatic treatment like Dicyclomin for spasmodic pains. Take probiotics and multivitamins. Boiled and cooled water. Wash hands with soap and water every time you visit bathroom. Fresh home made food only. And lastly see if any of the family members are suffering or not.