Deltoid area symptoms and conditions

I just had a IM kenalog80 injection in my butt with no problems yet. but I thought some would find useful these very clear warnings on a Canadian site after much searching. Too bad US patients can't find the same info as easily.

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"Unless a deep i.m. injection is given, local atrophy is likely to occur. (For recommendations on injection techniques, see Dosage.) Due to the significantly higher incidence of local atrophy when the material is injected into the deltoids area, this injection site should be avoided in favor of the gluteal area."

"injection should be made deeply into the gluteal muscle (see Warnings). For adults, a minimum needle length of 4 cm is recommended. In obese patients, a longer needle may be required. Use alternative sites for subsequent injections."

I've been trying to find out how long the shot will last. Some sites seem to say 30 to 40 days and others say longer but don't say how long. How long does it last?
- a new user

i've been prescribed levaquin off and on for about two years, last dose was a couple months ago, told the doctor i was allergic to sulfa drugs so i guess that was my only opp. so during the last two doses for a sinus infection i can't tell you the unbelievable pain in my neck and deltoid area i have tried everything pain pills lotions, neck rubs, nothing works. been off lev. for about a month now and i'm still in that same pain don't know what to do, any advice..........