http://rheuminfo.com/medications/methotrexate/inject-methotrexate
Not sure on the 16 vs 13 mm syringe
We get the smallest needle size (27 1/2 gauge or 28 gauge needle ) in a 1 cc (1 ml ) syringe which gives 25 mg
The presevative free mtx is single use vial usually 2 ml and gets tossed after every injection
The mtx with preservatives can be used multiple times
But is only good in the US per the CDC for 28 days once the vial is punctured
Ds gets 2ml vials for this so they are only used two weeks
As far as diet ds only avoids what can kill him (life threatening food allergies) and what makes him physically sick -wheat
Everything else is hit or miss
If it bothers him we hold off for a while and try again in a few months
Ds does sometimes get mtx on humira day
We were told to try and separate it in the beginning so they would know which drug was causing symptoms or a reaction
Now that isn't an issue and humira has been stopped and started so many times as well as mtx ...
With humira every 5 days shot day always changes