Most people do not get serious side effects from generic Levothroid tablets and in those cases where there are side effects it is usually the result of having too much thyroxine (T4), so the symptoms are the same as those resulting from hypothyroidism. These symptoms can include chest pain, excessive sweating, heat intolerance, nervousness, headache, insomnia, diarrhea, and fever. People that choose to order Levothroid online should carefully monitor themselves for side effects and immediately report such effects to their local physician. Although this drug will increase the body's metabolism, it is not effective as a weight loss drug and can become extremely dangerous if used in combination with appetite suppressants.