Fainting
Heart failure
Chest pains
Numbness and tingling sensations around the mouth or in the fingers and toes
Muscle cramps, particularly in the back and legs; may progress to muscle spasm ( tetany)
Wheezing
Difficulty swallowing
Voice changes due to spasm of the larynx
Irritability, impaired intellectual capacity, depression, and personality changes
Fatigue
Seizures