Gallopamil is obtained by condensing 2-(3,4,5-trimethoxypheny)-3-methylbutyronitrile (I) with N-(3-chloropropyl)-N-(2-(3,4-dimethoxyphenyl)ethyl]-N-methylamine (II) in the presence of bases. Compound (I) can be prepared by reaction of 3,4,5-trimethoxyphenylacetonitrile (III) with isopropyl chloride (IV) by means of NaNH2. Compound (II) is formed from 1-bromo-3-chloropropane (V) and N-[2-(3,4-dimethoxyphenyl)ethyl]-N-methylamine (VI).