Therefore, the use in pregnancy is not recommended. Side effects
The nasal spray form of mometasone may cause the following side effects:

headache
Viral upper respiratory infections
sore throat
nose bleeds
cough
muscle and joint painSerious side effects include: Thrush (fungal infection in the nose or throat), slow wound healing, eye problems such as glaucoma or cataracts, weakened immune system (immunodeficiency) which causes an increased susceptibility to infections and adrenal insufficiency. The inhaled form of mometasone for asthma may cause the following side effects

headache
stuffy or runny nose
dry throat
swelling of nose, throat and sinuses
flu like symptoms
painful menstrual periodsSerious side effects may include: allergic reactions (anaphylaxis), increased risk of osteoporosis, glaucoma and cataracts, thrush in the mouth or throat, growth retardation in children, bronchospasms, adrenal insufficiency and weakened immune system which causes an increased susceptibility to infections. The topical (skin cream) version may cause:

burning and itching at the application site
acne
changes in skin color
dryness at application site
skin soresThe only serious side effect that is known with mometasone topical is adrenal insufficiency. Pharmacology
Pharmacodynamics
Mometasone furoate reduces inflammation by causing several effects:
Reversing the activation of inflammatory proteins
Activating the secretion of anti-inflammatory proteins
Stabilizing cell membranes
Decreasing the influx of inflammatory cellsIn addition to the glucocorticoid properties of mometasone furoate, it is a very potent agonist of the progesterone receptor as well as a partial agonist of the mineralocorticoid receptor. Mechanism of action
Mometasone, like other corticosteroids, possesses anti-inflammatory, antipruritic, and vasoconstrictive properties. For allergies, corticosteroids reduce the allergic reactions in various types of cells (mastocytes and eosinophils) that are responsible for allergic reactions.
Combinations
The following combination drugs are available as of 2022:
Mometasone and azelastine as Nasaflex
Mometasone and clotrimazole and gentamicin for veterinary use as Mometamax and Mometavet
Mometasone and clotrimazole and mupirocin as Derma Q
Mometasone and florfenicol and terbinafine for veterinary use as Claro
Mometasone and formoterol as Dulera, Hexaler Bronquial Duo, and Zenhale
Mometasone and fusidic acid as Bactirest-M, Dermotil Fusid, and Momate-F
Mometasone and gentamicin and posaconazole for veterinary use as Mometamax Ultra
Mometasone and hydroquinone and tretinoin as Acnezac-MH
Mometasone and miconazole as Elica M, Elica-M, and Sensicort-F
Mometasone and mupirocin as Sensicort-B
Mometasone and orbifloxacin and posaconazole for veterinary use as Posatex, Posatex voor honden, and Posatex für Hunde
Mometasone and salicylic acid as Cortimax-S, Elicasal, Elocom Plus, Elosalic, Mezo-S, Momate-S, Momesalic, Momtas-S, Monsalic, and Sensicort-S
Mometasone and terbinafine as Cutizone-T, Mezo-T, and MomelomTerbi-Humanity
Mometasone and tiotropium as Tiomom

References
External links
"Mometasone". Drug Information Portal. U.S. National Library of Medicine.