Androgenetic alopecia (AGA) is the most common cause of hair loss. Many patients wonder: what should I take orally, what should I apply topically, and what can be injected? Oral medications, topical treatments, and mesotherapy now offer significantly more therapeutic options than they did just a few years ago.
Below is a structured and up-to-date overview of the main pharmacological treatment options for androgenetic alopecia.
- Oral medications (tablets)
- Finasteride 1 mg
A classic type II 5-alpha-reductase inhibitor. It reduces DHT levels by approximately 60%, thereby inhibiting follicular miniaturization and helping to slow or stop hair loss. It is one of the most extensively studied medications for androgenetic alopecia.
Link → Androgenetic Alopecia: An Update on Pathogenesis and Pharmacological Treatment - Dutasteride 0.5 mg
A more potent inhibitor that blocks both type I and type II 5-alpha-reductase, reducing DHT levels by more than 90%. It is often considered when finasteride does not provide a sufficient response. - Oral minoxidil (low-dose oral minoxidil)
Typically used at doses of 2–5 mg per day. It prolongs the anagen (growth) phase of the hair cycle and can increase hair shaft thickness and overall hair density. It may be particularly effective when combined with 5-alpha-reductase inhibitors.
- Topical treatments
- Minoxidil 5% (foam or solution)
The gold standard for topical treatment. It stimulates hair regrowth and helps strengthen existing hair. Older formulations could frequently cause scalp irritation due to alcohol and propylene glycol. Today, gentler foam formulations are more widely available. - Topical finasteride
Applied directly to the scalp with the aim of reducing systemic exposure compared with oral finasteride. Clinical studies have demonstrated efficacy while generally producing lower systemic exposure than the oral formulation. - Topical finasteride + minoxidil
A commonly used combination in which both active ingredients target different mechanisms involved in androgenetic alopecia.
- Mesotherapy and scalp injections
- Intralesional dutasteride (dutasteride mesotherapy)
Dutasteride is injected directly into the scalp. The aim is to achieve a local therapeutic effect while limiting systemic exposure. It is increasingly used as an option for patients with androgenetic alopecia who have an inadequate response to conventional treatments.
(Link → Effectiveness and Safety of Intralesional Dutasteride in Patients With Androgenic Alopecia: A Systematic Review and Meta‐Analysis ) - Mesotherapy with various formulations
Depending on the protocol, these may include minoxidil, peptides, vitamins, or growth factors. - PRP (platelet-rich plasma)
Used as a regenerative/supportive treatment to potentially improve hair density and follicular activity.
Side effects – should patients be concerned?
Oral finasteride and dutasteride may cause adverse effects, including:
- decreased libido,
- erectile or ejaculatory dysfunction,
- mood changes,
- dizziness.
(Link → Treatment options for androgenetic alopecia: Efficacy, side effects, compliance, financial considerations, and ethics)
For this reason, some patients consider topical treatments or local injection-based approaches as alternatives that may reduce systemic exposure. However, topical and injectable therapies are not necessarily free of systemic effects, and their safety and efficacy depend on the specific formulation, dose, administration technique, and available clinical evidence.
The most effective treatment approaches for androgenetic alopecia
- Basic approach: Finasteride 1 mg + topical minoxidil 5%
- Advanced approach: Dutasteride + low-dose oral minoxidil + topical minoxidil
- Alternative approach when systemic adverse effects are a concern: Topical finasteride with minoxidil or intralesional dutasteride
- Comprehensive approach: A combination of pharmacological treatment with mesotherapy and/or PRP
Summary
Today, pharmacological treatment of androgenetic alopecia offers a broader range of therapeutic options than it did several years ago. Topical treatments and local procedures can provide alternatives for patients who are concerned about systemic exposure, while maintaining therapeutic efficacy in appropriate patients.
Results typically begin to become noticeable after 3–6 months, with the best results generally observed after 9–12 months of consistent treatment. Treatment needs to be continued to maintain the benefits; after discontinuation, the underlying hair-loss process may resume.
