Formulations are described that are viscous and will benefit from
needle-free delivery at high driving pressures. Conventional delivery of
these viscous formulations by hypodermic syringes is inconvenient as well
as painful. Formulations include those which have a viscosity of about 5
cS or more at about 20.degree. C. and which can have 0.5 ml or more
administered by a needle-free injector in about 0.1 second.+-.0.02
seconds.