DosageDepending upon how long you have been suffering from constipation, you can take 5 to 10 grams of Isabgol. It can be taken with a glass of water, milk or fruit juice. To get relief from diarrhea, you can have it with curd or yogurt too. In case you are taking it for cleansing or detoxifying your body, your dosage can be 5 grams.