QivanaRx Glow Lab

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Probe · finasteride · 3 min read

Does finasteride 1 mg change PSA?

Yes. Finasteride 1 mg changes the PSA read. In clinical studies of PROPECIA in men 18-41, mean serum PSA decreased from 0.7 ng/mL at baseline to 0.5 ng/mL at Month 12. Tell the clinician and the lab. Finpecia 1 mg does not hide that shift. A confirmed rise from the lowest value on drug still needs a workup.

Medically reviewed by Dr. Mateo Ruiz, MD - Clinical pharmacology, Barcelona

Last reviewed

Updated

01The 0.7 to 0.5 read on 1 mg

Forest-green still life: lab slip folded in half, small tablet

That pair is the 1 mg hair-study number, not a 50% rule copied from older BPH files. 0.7 to 0.5 is a small absolute drop. It is still enough to confuse a one-off lab if nobody knows about the tablet.

Age 18-41 was the study band. An older man on 1 mg still needs the disclosure. Do not assume his PSA is 'too low to matter'.

02Where the famous 50% sentence lives

In older men on PROSCAR 5 mg for BPH, PSA levels are decreased by approximately 50%. That is a different strength and a different labelled job. This vault's tablet is 1 mg.

Clinicians who 'double PSA' are often using that 5 mg literature. Bring the actual 1 mg bottle to the visit instead of letting someone assume 5 mg. The 1 mg versus 5 mg probe is the product split.

03Why a rise from the lowest value matters

Any confirmed increase from the lowest PSA value while on PROPECIA may signal prostate cancer and should be evaluated, even if the number still sits inside the usual range for men not taking a 5-alpha-reductase inhibitor.

A 'normal' stamp on the printout does not close that sentence. The comparison is to his own lowest on-drug value.

04What to say before the blood draw

Name finasteride and the 1 mg strength. Say how long you have been taking it. If the script is leftover Propecia or a Finpecia 1 mg carton, say finasteride 1 mg. Brand is optional. The INN is not.

Bring the bottle to the visit. The 1 mg vault files PSA as a clinic fact, not a forum hack.

05How missed swallows scramble the number

Non-compliance with PROPECIA may also affect PSA test results. A week off before a draw, kept secret, leaves a number nobody can place.

Say whether you have been taking 1 mg. Do not freelance a washout to 'make the lab fair'.

06Does Finpecia 1 mg hide the PSA effect?

An export name is not a stealth androgen block. If the tablet is finasteride 1 mg, the 0.7-to-0.5 study still belongs in the conversation.

Doubling a 1 mg hair tablet also does not become BPH therapy. Do not treat kitchen math as a PSA strategy.

Sources

  1. DailyMed PROPECIA (finasteride) 1 mg
  2. US Propecia PI section 5.2 (PSA).

Checked against the current label and reviewed by Dr. Mateo Ruiz. See Probe, Assay, Glow-check, Seal.

Vault consult

Answers follow the U.S. Propecia label.

Anders V. My PSA is 0.5 on Finpecia 1 mg. Is that automatically safe?

Vault reply

In the 1 mg studies, mean PSA was 0.5 ng/mL at month 12 starting from 0.7. Your number still needs a clinician. A confirmed rise from your lowest on-drug value is the labelled trigger, even inside a 'normal' range.

Noor X. Should I stop 1 mg for a week so the PSA is 'real'?

Vault reply

The label warns that non-compliance can affect the result. A secret pause makes the number harder to read. Tell the lab you take finasteride 1 mg instead.

Piet K. The urologist doubles every PSA. I am on 1 mg, not 5 mg.

Vault reply

The approximately 50% drop is the 5 mg BPH literature. The 1 mg hair studies reported 0.7 to 0.5. Bring the bottle. Do not let someone assume you are on Proscar.

Before you start, stop, or change any medicine, speak with your prescriber or pharmacist - they hold your chart, this vault card does not. Open the vault disclaimer.