Is it ethical to drug my husband a bit?

My husband had some issues that I wasn't happy with and I've found a way to keep both of us relatively happy. If I want peace and quiet to sleep I slip a sleeping tablet or 2 in his tea. If I want sex I drug him with Viagra, if I want to stay up all night and talk I put some speed in his whiskey before he goes to bed. Is this unethical? I found him quite unbearable before but now I can control his mood and actions with drugs I'm much happier in the relationship. Is this detrimental to his health? He complains of various side effects but I discourage him from going to the doctor as he might find out about me secretly drugging him.