Hey there, yes I believe you could forget you took you med but you would have to take whopping dozes of the meds to cause an overdose. If you took 10 mg of Valium and then accidently took another 10 mg it would not be considered an overdose. We are talking taking a large amount of drug for an overdose.
It would depend on the drug of course and how many pills she took.
Now to answer that on a personal note, No, I would not forget I took the med but I might take another dose if the panic attack did not start to respond to the first dose after say 30-45 minutes. My RX is written for me to decide on how much I need but does have a limit.
Anxiety versus Panic
The terms anxiety attack and panic attack are often used interchangeably to mean the same thing. In this sense, the difference is purely a matter of semantics. But from a clinical perspective, panic and anxiety are defined by different features.
The differences between panic and anxiety are best described in terms of the intensity of the symptoms and length of time the predominant symptoms occur.
During a panic attack, the symptoms are sudden and extremely intense. These symptoms usually occur “out of the blue,” peak within 10 minutes and then subside. However, some attacks may last longer or may occur in succession, making it difficult to determine when one attack ends and another begins.
Anxiety, on the other hand, generally intensifies over a period of time and is highly correlated to excessive worry. The symptoms of anxiety are very similar to the symptoms of panic attacks.
Another important distinction is that, unlike a panic attack, the symptoms of anxiety may be persistent and very long lasting -- days, weeks or even months.
Hope this helps you with your question. :)