I agree that 5mg is a high does - most docs would give 2mg. Anyway he must have a reason for that dosage. I was told to take it 30 mins - 1. Diazepam, first marketed as Valium, is a medication of the benzodiazepine family that typically . Diazepam when taken late in pregnancy, during the third trimester, causes a definite risk of a severe .. Diazepam can absorb into plastics, so liquid preparations should not be kept in plastic bottles or syringes, etc. As such, it. I've taken diazepam at therapeutic doses (5mg, 10 at most). mg of clonazepam (with little to no tolerance) would be good with a couple of. How Long Does It Take For A 5Mg Valium To Work? As it is reported in Table 3in fact, 2mg pessaries show valium higher diazepam percentage on liquid bottom due to drug precipitation tendency. Because flumazenil is a short-acting drug, and the makes of diazepam can last for days, several doses of flumazenil may be necessary. This is not who as a first line agent because the injection contains benzoic acid, benzyl alcohol, and sodium benzoate: Diazepam is a benzodiazepine ben-zoe-dye-AZE-eh-peens. Okoromah, Christy AN, ed.