The primary benefit of isabgol is its ability to treat mild to moderate constipation. While it is believed to treat a range of other health troubles, these other uses are not approved for professional labeling purposes.  Isabgol increases the amount of bulk in your stools. This increase in mass promotes movement through the intestines.  Moreover, isabgol increases the amount of water in your stools. As a result, the stools become softer and easier to pass. Most studies suggest that isabgol does contribute an increase in stool weight and bowel movements per day, as well as a decrease in total gut transit time. This product has even been used as an ingredient in bulk laxatives. If a doctor prescribed isabgol to you, follow his or her instructions regarding dosage amount and frequency. If you are using isabgol without being told to do so by a doctor, follow the directions provided on the label.  Usually, you will need to take 1 to 2 tsp (5 to 10 ml) of isabgol with 8 oz (240 ml) of fluid daily until your constipation passes. The exact dosage may vary depending on age, medical condition, and response to treatment, however. It is highly recommended that you consult with your doctor before starting treatment with isabgol, no matter what you plan on using it for. If you have any concerns or questions, talk to your doctor or pharmacist. You can usually take isabgol as a powder, tablet, or wafer. No matter which form you take it in, you should always consume the supplement with 8 oz (240 ml) of water or another liquid to prevent choking.  Swallow isabgol tablets with at least 8 oz (240 ml) of water. If you are using the powder, dissolve the powder in 8 oz (240 ml) of liquid. Add it to the liquid, stir well, and drink immediately, taking care not to inhale the powder. Note that isabgol can plump up and become thick if you allow it to sit and absorb the liquid. If you are taking isabgol wafers, chew them thoroughly before swallowing. Follow by drinking 8 oz (240 ml) of liquid.

TL;DR in Vietnamese:
Dùng isabgol để trị táo bón. Tuân theo hướng dẫn chính thức. Uống isabgol với một cốc chất lỏng đầy.