Drotaverine HCl works by inhibiting the enzyme phosphodiesterase IV, which leads to an increase in cyclic adenosine monophosphate (cAMP) levels, resulting in the relaxation of smooth muscles. It is typically administered in the form of an injection, and the usual dosage for adults is 40-80 mg per day.
As with any medication, drotaverine HCl may cause side effects in some people. Common side effects may include dizziness, headache, and gastrointestinal problems such as nausea or vomiting.