Hello from JustAnswer.
As you are probably aware, since you asking the question, it is generally recommended to avoid combining Ativan with alcohol. So, the issue in this situation is whether there is still a sufficient amount of Ativan in your system that there would still be an issue 6 and 1/2 hours later, and the answer is yes.
Obviously, the drug will peak about 1/2 - 1 hour after swallowing the medicine The level will gradually decrease after the peak. The time that it takes for the level to decrease by half s called the half-life, and the half-life for Ativan is at least 10 hours, and can be as long as 20 hours. So, at 6 and 1/2 hours, the level will likely be about 70-80% of the peak level, so the level would still be such that the overall recommendation to avoid combining the Ativan and alcohol would still be in effect.
Obviously, combining alcohol with Ativan at 70-80% of the peak level would not be as risky as combining alcohol with the peak level, but it still would be recommended to avoid the combination.
For future reference, it is generally considered OK if the patient waits for the level to be about half of the peak, so about one half-life, or at least 10 hours for the Ativan. It still would be appropriate to be cautious with alcohol intake at that point in time, particularly being cautious about driving, but a low level of alcohol intake would be OK.
If I can provide any additional information, please let me know.