Yup! What she said. 
I have found that a nice soft towel is really helpful to keep everyone feeling safe and calm. Once you "pin" a uros arms to his side and immobilize his tail he will usually just lie still, close his eyes, and (I always imagine) go "OMG is it over yet!?" like a little kid. Less importantly, it will also protect your arms/hands from tail spikes. Ouch! 
Keep us posted on what types of meds he prescribes and I am sure we can provide some suggestions on giving it. 
I recommend asking the vet very explicitly if he has worked with Uros before, and in what capacity. If he hasn't worked explicitly with Uros, he may still be your best bet if he has other exotic reptile experience, but in that case it is often a good idea to do a little research on your own about the medication and dosage. Just like working with "people doctors". 
Keep us posted!! 
Elizabeth
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1.0 Mali Uro Archimedes (May he rest in peace)
0.0.1 Egyptian Uro Zuberi Mosca Khu (Mosca)
0.1 Sulcata Minnie
1.1 Iguanas Flik and Loki
Madison, Wisconsin