Oral Minoxidil Efficacy and Safety

Safety Profile and Adverse Effects

The American Academy of Dermatology reports that oral minoxidil is associated with systemic absorption leading to predictable side effects, including hypertrichosis, dizziness, and lower limb edema, with large safety data from 435 patients treated with low-dose oral minoxidil (≤5 mg/day) confirming generally good tolerability 1, 2, 3
The American Academy of Dermatology also notes that topical minoxidil is better tolerated due to avoiding injection-related pain when compared to other treatments, though this comparison was with PRP rather than oral formulations 4

The American Academy of Periodontology suggests that oral minoxidil should be avoided in patients with cardiovascular disease requiring careful risk assessment 4