Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
L'Abbé plot showing results for sumatriptan plus naproxen versus placebo for headache relief at two hours in studies with moderate or severe baseline pain. Each circle represents a different study; size of circle is proportional to size of study; diagonal is line of equivalence.
