I can't find one. Can someone please help here? Even their own Web site has no such caution.

The reason I asked is because my sister who has suffered from headaches for years said she had put voltaren gel on her neck and has not had a headache for a month. She has tried everything and was about to try Botox at her neurologist’s suggestion. I was hoping the voltaren would be safe for her.

Hi @anet, All I know is what I read on the box. Also, an illustration that came with Voltaren had a diagram of the human body with the red spots where you can apply it, did not show red spots on the shoulder or neck. I elected not to use it. @JohnBisjhop below offers an explanation. Thanks, John!anet