No, taking a 1 mg finasteride tablet twice weekly is NOT equivalent to 0.2 mg daily
Taking 1 mg twice weekly (2 mg/week total) delivers approximately 10 times more drug than 0.2 mg daily (1.4 mg/week total), and the pharmacokinetics of finasteride do not support intermittent dosing as equivalent to lower daily doses.
Why This Dosing Strategy Doesn't Work
Pharmacokinetic Mismatch
The fundamental issue is that finasteride has specific pharmacodynamic properties that make intermittent high-dose administration different from continuous low-dose therapy 1. After a single 5 mg dose, maximum DHT suppression occurs at 8 hours and is maintained for 24 hours with daily dosing 1. The drug forms a stable enzyme complex with Type II 5α-reductase with extremely slow turnover (half-life ~30 days) 1.
Total Weekly Dose Discrepancy
Your proposed regimen would deliver:
- Twice weekly 1 mg: 2 mg per week
- Daily 0.2 mg: 1.4 mg per week
This represents a 43% higher weekly dose than intended, not an equivalent amount.
Evidence Against Intermittent Low-Dose Equivalence
The dose-response studies in male pattern hair loss clearly demonstrate that 0.2 mg daily is the minimum effective dose, with efficacy demonstrated at 0.2 mg/day or higher 2. Importantly, doses of 0.2 mg daily maximally decreased both scalp skin and serum DHT levels 3. However, 1 mg daily showed superior efficacy to 0.2 mg daily in head-to-head comparisons 2, 4.
What the Evidence Actually Shows About Intermittent Dosing
Limited Support for Intermittent Regimens
While one study showed that finasteride 1 mg every other month (not twice weekly) maintained therapeutic effects after initial daily treatment 5, this was:
- Only for maintenance after 1 year of daily therapy
- Not for initial treatment
- Still showed decreased hair density compared to daily dosing
Another study in women with hirsutism found that 2.5 mg every 3 days was as effective as daily dosing 6, but this:
- Used a much higher dose (2.5 mg vs 1 mg)
- Was in a different condition (hirsutism, not hair loss)
- Cannot be extrapolated to your proposed regimen
No Evidence for Twice-Weekly 1 mg Dosing
There are no studies validating 1 mg twice weekly as equivalent to any daily low-dose regimen for androgenetic alopecia.
The Correct Approach
If you want to take 0.2 mg daily, you need to either:
Obtain 0.2 mg tablets (if available in your region - this was studied in Japanese populations 4)
Split or compound your 1 mg tablets to achieve approximately 0.2 mg daily (cutting into fifths, though this is imprecise)
Consider the standard 1 mg daily dose instead 1, which has:
Critical Safety Considerations
Why Precision Matters
Finasteride has teratogenic potential and can cause sexual dysfunction 7. Inconsistent dosing creates:
- Unpredictable DHT suppression
- Variable drug exposure
- Difficulty monitoring for side effects
- Challenges in determining if adverse effects are dose-related
Recent Safety Signal
A 2026 case report documented internal carotid artery occlusion in a 40-year-old man taking finasteride 1 mg daily with minoxidil 8, highlighting the importance of using established, evidence-based dosing regimens where safety profiles are well-characterized.
Bottom Line
Do not use 1 mg twice weekly as a substitute for 0.2 mg daily. The total weekly dose is substantially different, the pharmacokinetics don't support equivalence, and there is no clinical evidence validating this approach. If cost or pill-splitting difficulty is driving this question, discuss with your physician about either obtaining the appropriate dose formulation or using the standard 1 mg daily regimen, which has the strongest evidence base 1, 2, 4.