Testosterone nasal gel is indicated for the treatment of men who have a condition called “hypogonadism”, which in turn is the inability to make enough natural testosterone. For those who are not familiar with the word “testosterone”, it refers to a certain male hormone responsible for the growth and development of the male sex organs. Before you use this product, you should tell your doctor about your allergies, be it to foods, drugs, animals…etc. According to mayoclinic.org, elderly patients who use testosterone nasal gel “may be at an increased risk for developing heart and blood vessel problems, or prostate problems”. Therefore, they must be very cautious when receiving this medication. Of course, women (pregnant or otherwise) should not use testosterone nasal gel. However, for those who are pregnant, coming in contact with the medicine (i.e. through sexual intercourse) may cause birth defects. So, make sure you tell your doctor if your sexual partner is pregnant before using the product in question. Also don’t forget to tell them about your other health conditions and all the drugs that you’re taking, because certain drugs/health problems may affect the use of testosterone nasal gel. When it comes to the common side effects, they include headache, muscle aches, sore throat, and unusual weakness. Even though the following side effects are considered less common, you should seek medical help when any of them occurs: breathing problems, ear congestion, loss of voice, and body aches.