I've never taken/been Rxed Ketotifen but here's an ironic twist. I had a severe adverse reaction to Singulair. Two days, yes, just two days on Montelukast and I suffered dramatic vertigo for the first time in my life. Almost fell down a flight of stairs at home as I started to black out from my head spinning. Called my Allergist's office and someon on her staff said, "No, vertigo is not a side effect." Well... I'm super in touch with my body, have had exactly zero imagined events, no psychosomatic predilections, the opposite of a hypochondriac, reality based. I felt what I felt. I experienced what I experienced. I did a super basic search on the Internet and learned that one of the side effects of Montelukast is...

VERTIGO! Different from standard dizziness. So, nyah, nyah, nyah, nyah, nyah! As usual, the patient knows more than the medical "professionals."

Trust your body! Listen to your body. You are you!