Treatment of meningococcal meningitis:
Drug of choice – Penicillin G 

In case of penicillin resistance, third generation cephalosporins should be used ( Ceftriaxone / CefotaximeIn case of penicillin / cephalosporin allergy, Chloramphenicol is used

Thyroid inhibitors 
a) Inhibit hormone synthesis (anti thyroid drugs): Propylthiouracil, Methimazole, Carbimazole 

b) Inhibit iodine trapping (ionic inhibitors): Thiocyanates, Perchlorates, Nitrates. 

c) Inhibit hormone release: Iodine, NaI, Kl

d) Destroy thyroid tissue: Radioactive iodine

Gingivitis is a form of periodontal disease. Periodontal disease is when inflammation and infection destroy the tissues that support the teeth, including the gingiva (gums), the periodontal ligaments, and the tooth sockets (alveolar bone Malocclusion of teeth (misaligned teeth), rough edges of fillings, and ill fitting or unclean mouth appliances (such as orthodontic appliances, dentures, bridges, and crowns) can irritate the gums and increase the risk of gingivitis.

Medications such as phenytoin and birth control pills, and ingestion of heavy metals such as lead and bismuth are also associated with gingivitis.

endorphins are endogenous molecules having morphine like properties

Methemoglobinemia is a condition in which the iron within hemoglobin is oxidized from the ferrous (Fe2+) state to the ferric (Fe3+) state, resulting in the inability to transport oxygen and carbon dioxide. Clinically, this condition causes cyanosis, often posing a diagnostic dilemma
usually results from exposure to oxidizing substances (such as nitrates or nitrites, aniline dyes, or medications, including lidocaine, prilocaine, phenazopyridine hydrochloride (Pyridium], and others)