Will amitriptyline 10mg cause weight gain if i count calories?

Calories: I don't think a small dose of amitriptyline would be a primary cause of weight gain. You're correct in feeling that calories are a key to losing weight. You have to reduce daily calories by 500 for a week to lose one pound. A dietician at your hospital can determine your ideal weight, ideal daily calorie intake, critique your eating habits & give a sample diet in one visit.