Electrocution involves a much higher level of current than what Tasers use. Obviously Taser designers try to make the temporary paralysis effect work with no lasting permanent damage or death. There are medical conditions that can make the Taser use result in serious injury or death, but thankfully those are rare.
True electrocution cannot be blunted by any drug that I'm aware of. There are probably a few medical drugs that can lower the sensitivity of the heart's electrical pacemaker nodes and distribution nerves to outside electrocution, but just by a little, and AFAIK, recreational drugs would not fall into this category.
There are some medical conditions and some recreational drugs that can lower the sensitivity of a person to the effects of the limited Taser shocks, and those are very problematic for Law Enforcement Officers (LEOs). If the less-than-lethal Taser does not work well enough to let the officers safely take the individual into custody, then the escalation of force can result in bad things for the person who they are trying to detain or arrest.
What reading have you been doing on this question on your own? There should be many helpful articles on how some illnesses and some recreational drugs affect the effectiveness of Tasers...