Vidalista 20 mg is known as a PDE-5 inhibitor. Vidalista 20 can also cause the following adverse effects due to overdose, in this case, it’d be best to call for emergency services or rush to your nearest doctor, also keep in mind to ask someone to assist you if you are rushing to the doctor. Tadalafil relaxes the muscles of the blood vessels and increases blood flow to particular areas of the body.