Is there much adrenalin in dental injections?

Very little: The term for it in the local anesthetic is epinephrine. Most commonly used anesthetics use either 1:100,000 or 1:200,000 that is 0.001% or less. Very little. It is used to help the anesthetic last longer so that it lasts the entire appointment and beyond as needed. Some last longer than others as well.

No: epinephrine, yes, but not enough to make you go "pulp fiction" but just enough to make your heart race if some small amount gets into the blood stream.

No, epinephrine: The lidocaine local anesthetic with epinephrine used at the dentist daily.

Depends: There are some anesthetics without any vasoconstrictor, including epinephrine and neocobefrin. Most commonly we use ones with epinephrine to constrict the vessels and keep the anesthetic localized longer for greater effect over a longer period. Also we will use ones with more epinephrine to minimize localized bleeding. You can request no Epi, but may need more injections due to short acting effect