It is rarely used alone.It is often used in the following situations:
Bronchiectasis
Bone and joint infections
Granulocytopenia, when combined with ticarcillin, in people with cancer
Intra-abdominal infections (such as peritonitis) as an adjunct to other medicines, like clindamycin, metronidazole, piperacillin/tazobactam, or ampicillin/sulbactam
Meningitis:
for meningitis by E. coli, as an adjunct to imipenem
for meningitis caused by Pseudomonas, as an adjunct to meropenem
for meningitis caused by Acetobacter, as an adjunct to imipenem or colistin
for neonatal meningitis caused by Streptococcus agalactiae or Listeria monocytogenes, as an adjunct to ampicillin
for neonatal meningitis caused by Gram negative bacteria such as E. coli, as adjunct to a 3rd-generation cephalosporin
Mycobacterial infections, including as a second-line agent for active tuberculosis. It is also used for infections by Mycobacterium avium, M. abcessus, M. chelonae, and M. fortuitum. Rhodococcus equi, which causes an infection resembling tuberculosis
Respiratory tract infections, including as an adjunct to beta-lactams or carbapenem for hospital-acquired pneumonia
Sepsis, including that in neonates, as an adjunct to beta-lactams or carbapenem
Skin and suture-site infections
Urinary tract infections that are caused by bacteria resistant to less toxic drugs (often by Enterobacteriaceae or P. aeruginosa)Amikacin may be combined with a beta-lactam antibiotic for empiric therapy for people with neutropenia and fever. Available forms
Amikacin may be administered once or twice a day and is usually given by the intravenous or intramuscular route, though it can be given via nebulization. There is no oral form available, as amikacin is not absorbed orally. In people with kidney failure, dosage must be adjusted according to the creatinine clearance, usually by reducing the dosing frequency.
Hypogonadotropic hypogonadism (HH),  is due to problems with either the hypothalamus or pituitary gland affecting the hypothalamic-pituitary-gonadal axis (HPG axis). Hypothalamic disorders result from a deficiency in the release of gonadotropic releasing hormone (GnRH), while pituitary gland disorders are due to a deficiency in the release of gonadotropins from the anterior pituitary. GnRH is the central regulator in reproductive function and sexual development via the HPG axis. GnRH is released by GnRH neurons, which are hypothalamic neuroendocrine cells, into the hypophyseal portal system acting on gonadotrophs in the anterior pituitary. The release of gonadotropins, LH and FSH, act on the gonads for the development and maintenance of proper adult reproductive physiology. LH acts on Leydig cells in the male testes and theca cells in the female. FSH acts on Sertoli cells in the male and follicular cells in the female. Combined this causes the secretion of gonadal sex steroids and the initiation of folliculogenesis and spermatogenesis. The production of sex steroids forms a negative feedback loop acting on both the anterior pituitary and hypothalamus causing a pulsatile secretion of GnRH. GnRH neurons lack sex steroid receptors and mediators such as kisspeptin stimulate GnRH neurons for pulsatile secretion of GnRH. Types
There are two subtypes of HH, congenital HH (CHH) and acquired HH (AHH). CHH is due to genetic abnormalities resulting in non-functional GnRH secreting neurons or gonadotropic cell dysfunction in the anterior pituitary. CHH is divided into 2 subtypes depending on the condition of the olfactory system, anosmic HH (Kallman syndrome) and normosmic HH.