I was with one of my old friends yesterday and he was addicted to football gambling to the extent that he is finding it very difficult to sleep and do normal activities. He has won some of betting he has played on but correctly want to give it some time off. He is asking for general advice if drugs can help.
There is no "anti-gambling drug". There may be many drugs that could potentially help with impulse control, but you are essentially feeding a dopamine rush every time you decide to gamble - win or lose. I don't think it is wise to replace one chemical inducing addiction with another chemical. Your friend needs to really figure out what it is that is driving them to gamble and learn to control themselves - it might be boredom, trying to recreate a feeling of happiness they found at an earlier point in life, lack of alternative stimulation, chasing losses or all manner of things. Until they identify the trigger and aim to deal with it, any drug is simply going to be suppressing an urge that could come back with a vengeance later.