Local anesthetic action, also known as "membrane-stabilizing" action, is a prominent effect of several -blockers Acebutolol, Labetalol, Pindolol Propranolol.
This action is the result of typical local anesthetic blockade of sodium channels and can be demonstrated experimentally in isolated neurons, heart muscle, and skeletal muscle membrane.

Heparin-associated thrombocytopenia may be associated with irreversible aggregation of platelets and treating venous thromboembolism. The incidence of thrombocytopenia after administration of LMWH is lower than with standard heparin. Adverse drug reactions like those caused by standard heparin have been seen during therapy with LMWH, and overdose is treated with protamine.

Functions of delta type opioid receptors are:

supraspinal analgesia 
spinal analgesia 
modulation of hormone and neurotransmitter release

Long acting non-depolarizing (competitive) NM blocking agents require reversal with neostigmine.
Mivacurium is the shortest acting NDMR. It does not require reversal due to its short duration of action.
Mivacurium can be used in day care surgery.

Morphine is contraindicated in head injury for the following reasons:

Causes carbondioxide retention – this in turn increases intracranial tension 
Therapeutic doses can cause respiratory depression in head injury patients Vomiting, miosis and altered mentation caused by morphine can interfere with assessment of neurological status

Morphine should be avoided in those with bronchial asthma as it can precipitate an attack of asthma. But it is not contraindicated