I will travel by plane with my anxious 3.5 year old cat, i will give gabapentin capsule for first time. They prescribed 25mg per kg of cat but in a way it feels a little too much, do you think its a good idea to test with 10-15mg per kg a day before travel to see how he reacts take him to car etc?

How much do you usually give to ur cat? And were there any dangerous side effects even if u go over the suggested amount?