In the case of an overdose of Drotaverine 40mg Tablets, symptoms may include severe dizziness, fainting, rapid heartbeat, and in extreme cases, seizures. If you suspect an overdose, it is important to seek medical advice promptly. Do not induce vomiting, as this may worsen the situation. Medical professionals should be contacted immediately to provide appropriate treatment and support, which may include monitoring vital signs and providing symptomatic relief.