Well both ambien and lorazepam are related to each other but dont belong to the same group. Both of them are known to cause sedation and it is recommended that you DONT take them together because of a drug interaction which can cause increased sedation. However they CAN be used together if recommended by your doctor, if he knows about these two drugs and you are taking them under his supervision then you should be fine. Secondly if they are taken with a gap of 8 - 12 hours even then you should be fine BUT only after discussing this with your doctor.
The side effects of ambien can include a number of things
Sleepiness or unusual drowsiness
Lorazepam can cause
Here are a couple of links which list their side effects in detail
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