Phenibut is a mild Noopept analogue that has been shown to have anti-anxiety effects. It can be taken at night, before bed, or in the morning. Pregnant women should avoid Phenibut as well as anyone who has liver problems or other medical conditions. It’s also important to note that you shouldn’t take more than 1 gram of the substance per day without consulting your doctor first. The dosage for Phenibut varies depending on where you buy it from and how much of it you plan on taking each day, but most people start out with about 300 milligrams (mg) per dose, which makes up approximately 10 grams total over the course of a week’s time.