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Some common medications can harm male fertility, but many effects can be reversed.

Long-term testosterone therapy can cause hormone suppression, affect prostate and heart health, and alter physical characteristics, but does not increase prostate cancer risk and needs more research for full risk assessment.

Testosterone replacement therapy can prevent men from fathering children and should not be used by those wanting to stay fertile.

Wait 3 months after COVID-19 before trying assisted reproduction and further research is needed on COVID-19's effects on male hormones and fertility.

COVID-19 may harm male fertility and damage the reproductive system.

Some common medications may harm male fertility by affecting hormones, sperm production, and sexual function.

Anabolic steroid abuse can cause sexual, fertility, and health problems.

Anabolic-androgenic steroids harm male hormone levels, sperm, metabolism, and can cause acne, hair loss, and breast growth.

5α-reductase-2 deficiency causes ambiguous genitalia at birth and affects male sexual development, but individuals often develop male characteristics at puberty.

HNG may help prevent the negative effects of chemotherapy on sperm production and white blood cell counts.

Finasteride doesn't harm male fertility or sperm quality, but may slightly reduce ejaculate volume.

A small BOTOX dose improved sperm production and movement in older mice.

A mild botulinum toxin injection improved sperm production and movement in aging mice.

Finasteride daily doesn't affect sperm production or semen in young men.

PDRN from trout sperm helps skin and hair regeneration but is costly and complex to produce.

Finasteride may decrease semen quality but not harm sperm production, and stopping the drug can improve semen quality; hyperprolactinemia can cause infertility but is treatable with medication.

Medical treatments like chemotherapy and radiotherapy can harm sperm production, so freezing sperm before treatment is important for men who want children later.

Finasteride causes sperm production decrease in Mesocricetus auratus.

Finasteride significantly reduced sperm production and caused testicular atrophy in hamsters.

Finasteride doesn't change rat testicle weight or sperm production.

COVID-19 may harm male fertility by affecting sperm production.

Finasteride may cause infertility in rats by affecting epididymis and sperm function.

New male contraceptive pills show promise in reducing sperm production with mild side effects.

Lipocalin-Type Prostaglandin D2 Synthase (L-PGDS) is a protein that plays many roles in the body, including sleep regulation, pain management, food intake, and protection against harmful substances. It also affects fat metabolism, glucose intolerance, cell maturation, and is involved in various diseases like diabetes, cancer, and arthritis. It can influence sex organ development and embryonic cell differentiation, and its levels can be used as a diagnostic marker for certain conditions.

Antiandrogens can treat acne, hirsutism, and seborrhea by reducing sebum production and androgen action.

The combination of cyproterone acetate and testosterone enanthate is highly effective in preventing sperm production and could be a good reversible male contraceptive.

A man with testotoxicosis was fertile despite low FSH levels, suggesting high testosterone may allow sperm production without FSH.

Dihydrotestosterone and 5α-Reductase play a role in hair loss and prostate health, and finasteride can increase hair growth in men without affecting sperm production, but it doesn't work for postmenopausal women with hair loss.

Finasteride, at doses of 5mg or higher, may negatively affect male fertility by reducing the expression of certain genes involved in sperm production.

The testes produce sperm and hormones essential for male development.