Mechanism of steroid and peptide hormones

Steroid and antibiotic eye drops - hydrocortisone/neomycin/polymixin B; loteprednol/tobramycin; prednisolone/gentamycin; prednisolone/sulfacetamide; hydrocortisone /neomycin/bacitracin/ polymyxin B (Blephamide, Catapred [discontinued], Isopto, Pred-G, Poly-Pred [discontinued], Tobradex, Zylet and many other brands) are steroid and antibiotic eye drops prescribed to prevent or treat eye infections that are associated with inflammation. Side effects, drug interactions, dosage, and pregnancy safety information should be reviewed prior to using these medications.

During conventional pharmacologic dose corticosteroid therapy, ACTH production is inhibited with subsequent suppression of cortisol production by the adrenal cortex. Recovery time for normal HPA activity is variable depending upon the dose and duration of treatment. During this time the patient is vulnerable to any stressful situation. Although it has been shown that there is considerably less adrenal suppression following a single morning dose of prednisolone (10 mg) as opposed to a quarter of that dose administered every six hours, there is evidence that some suppressive effect on adrenal activity may be carried over into the following day when pharmacologic doses are used. Further, it has been shown that a single dose of certain corticosteroids will produce adrenal cortical suppression for two or more days. Other corticoids, including methylprednisolone, hydrocortisone, prednisone, and prednisolone, are considered to be short acting (producing adrenal cortical suppression for 1¼ to 1½ days following a single dose) and thus are recommended for alternate day therapy.

In addition to these functions, the decrease in FSH concentrations with rising estrogen concentrations is thought to play an important part in the selection of the dominant follicle. The declining secretion of FSH prevents multiple follicular development, as only the largest of the developing follicles stays above the FSH threshold, has the most FSH receptors, remains most sensitive to FSH and produces most estrogen. It is then less sensitive to the declining FSH concentrations and can continue to develop while others fade into atresia due to lack of enough FSH stimulation. The induction of LH receptors on the largest developing follicle(s) enables LH to take a part in the development of the dominant follicle in the late follicular phase and prepare it for the oncoming LH surge.

Mechanism of steroid and peptide hormones

mechanism of steroid and peptide hormones

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