It is crucial that you tell your doctor if you are allergic to diazepam, as it can be dangerous to take it if you are. You will also need to let your doctor know if you take antacids, if you have glaucoma, seizures, or lung, heart, or liver disease. There are certain people who should not take Valium, including women who are pregnant or breast-feeding. There are certain risks and benefits associated with taking this medication if you are over the age of 65. Older adults should typically avoid taking this medication because it is unsafe, at least compared to other medications that can be used to treat the same conditions.