I've had really good luck taking Buspirone (Buspar) in conjunction with Gabapentin (Neurontin) for treatment of anxiety.
I started on 20 mg daily of Buspirone. The dose was then raised to 30 mg. A month after that, it was increased to 60 mg.
I've found that Buspirone does take a couple of weeks at each dosage level to give you its full effects. When this drug was first prescribed to me, I was also prescribed 300 mg of Gabapentin to take at bedtime for night-time anxiety attacks (which, for me, were much more intense than those I'd experienced during the day). Then, when I moved to 30 mg, I augmented the 300 mg of bed-time Gabapentin with three 100 mg doses of Gabapentin throughout the day to help further alleviate my anxiety symptoms while I was waiting for the 30 mg dose of Buspirone to kick in.
Now that I'm at 60 mg of Buspirone I only need the 300 mg bed-time dose of Gabapentin. I'm taking 30 mg of Buspirone twice a day. I'm very happy with this combination of drugs.
Gabapentin, by the way, is only approved by the FDA for seizure control. I don't have seizures. But Gabapentin also has a number of so-called "off label" uses and is often prescribed by psychiatrists for anxiety disorders, for example. Like Buspirone, it is non-addictive and relatively low on side effects. But unlike Buspirone, Gabapentin works immediately.
As others in this forum have said, though, reactions to meds are a very individual thing. For instance, I've found that I don't seem to do well on SSRIs. When I was prescribed Lexapro (and after that, Celexa), I felt fuzzy-headed for a week or two before having to start fending off awful physical panic attacks, complete with heart palpitations and shortness of breath. So I dumped both of those SSRIs right away, before there was much of them in my system. Then the physical panic attacks from the SSRIs stopped within the next few days.
I've been diagnosed with "adjustment disorder with mixed moods," following a series of traumatic events in my life. I've experienced very little depression, actually, but my anxiety was initially diagnosed as "severe," and I've been told that my anxiety symptoms are very similar to those of people with generalized anxiety disorder (GAD).
I hope that this info is helpful to some of you out there.