90% of Valium is absorbed and the peak effect of Valium is seen within 1 to 1.5 hours in most people. Diazepam is 98% bound to plasma proteins. Food delays the time to peak to about 2.5 hours.

How long does diazepam take to peak?

After oral administration >90% of diazepam is absorbed and the average time to achieve peak plasma concentrations is 1 – 1.5 hours with a range of 0.25 to 2.5 hours. Absorption is delayed and decreased when administered with a moderate fat meal.

How long does it take Valium to kick in?

1 When administered via injection, valium takes just one to five minutes to take effect. When taken orally, people usually begin to feel the effects 15 to 60 minutes after ingestion. Rectal gel may be used for those who are experiencing seizures and begins working quickly after administration.