Testosterone Propionate also converts to both Estrogen (through Aromatization) and Dihydrotestosterone (through 5a-reduction). Most of the side effects people experience with testosterone use is actually from it’s conversion to these two substrates. Thus, hair loss , water retention, acne, and other side effects are possible with use of this drug. Conversion to these hormones is also responsible for some of testosterone’s ability to build muscle; therefore when many side effects are avoided with the use of ancillary compounds, some of the muscle building properties are also stunted.
Testosterone can also be stacked with oral compounds as well (remember that Testosterone blends, mixes, and stacks well with almost anything and is very versatile). Most commonly, oral compounds are used alongside long-estered Testosterone variants such as Enanthate or Cypionate. They are normally used for the first 6 – 8 weeks of the cycle due to the longer amount of time required for the longer-estered Testosterone variants to ‘kick in’. This is because the longer half-lives facilitate a slower rise in blood plasma levels until they are at peak optimal levels. Once they reach this point, gains are typically experienced (normally the 4th or 5th week). The oral compound used (such as Dianabol, for example) allows the user to experience gains during the first several weeks while the long-estered Testosterone builds in the system.
Common (1% to 10%): Sinusitis, nasopharyngitis, upper respiratory tract infection, bronchitis
Uncommon (% to 1%): Cough, dyspnea, snoring, dysphonia
Rare (less than %): Pulmonary microembolism (POME) (cough, dyspnea, malaise, hyperhidrosis, chest pain, dizziness, paresthesia, or syncope) caused by oily solutions
Frequency not reported: Sleep apnea
Postmarketing reports: Chest pain, asthma, chronic obstructive pulmonary disease, hyperventilation, obstructive airway disorder, pharyngeal edema, pharyngolaryngeal pain, pulmonary embolism, respiratory distress, rhinitis, sleep apnea syndrome [ Ref ]