The short answer: finasteride is a slow treatment because hair grows in slow cycles. The first year tends to move from possible early shedding, through the first signs of stabilisation, to a point around twelve months where you can fairly judge the result. Patience and photographs are your friends.
Months 1 to 3: little to see, and maybe some shedding
Early on, most men see nothing at all, which is normal. Some notice a temporary increase in shedding in the first weeks or months. This can be unnerving, but it often reflects follicles moving into a new growth cycle rather than treatment failing. It usually settles. If shedding is heavy or prolonged, mention it to your clinician.
The reason nothing shows in the first weeks is worth understanding. Finasteride lowers scalp DHT within days, but hair follicles only respond over their own slow cycle, so the biology is working long before the mirror agrees. How finasteride works on DHT covers the mechanism in full. The practical takeaway for month one is simply this: start, be consistent, and do not expect to see anything yet.
Months 3 to 6: the first signs
This is when many men notice that their hair is falling out less than it was. The change is often subtle: fewer hairs on the pillow or in the shower, and thinning areas that seem to hold steady rather than worsen. Regrowth, if it comes, tends to begin around now but builds slowly.
It helps to reset what 'working' looks like at this stage. Stabilisation, meaning loss that has stopped getting worse, is itself a real result even if nothing looks visibly better yet. Because pattern loss is progressive, holding the line is often the main prize, with regrowth as a welcome bonus on top rather than the sole measure of success.
Months 6 to 12: building the picture
Over the second half of the year, improvements become easier to see, particularly at the crown, which tends to respond better than a receding hairline. Progress is gradual and easy to miss day to day, which is exactly why comparison photos matter so much.
For the photos to be useful they need to be consistent: same room, same time of day, same lighting, hair dry and styled the same way, and shots from the front, crown and both temples. Natural daylight near a window works better than a bathroom bulb, which casts shadows that exaggerate thinning. Take the first set before your very first tablet, then repeat monthly. When you compare month one with month nine side by side, changes that were invisible day to day become obvious. Our guide to tracking hair loss progress sets out a simple routine worth copying.
At twelve months: a fair assessment
Around the one-year mark you can make a reasonable judgement about how well finasteride is working for you. For many men it has slowed or halted loss and recovered some density. For others the effect is more modest. Either way, twelve months of consistent daily use gives you real information rather than a guess.
The long-term trial data is reassuring on the point of persistence: in the five-year studies of 1mg finasteride, the men who kept taking it largely maintained the ground they had gained, while improvement in the placebo group did not happen. The NHS overview of hair loss is a useful neutral primer if you want to sense-check what you read elsewhere. How much you can realistically expect also depends on how advanced the loss was to begin with, which is where your Norwood stage sets expectations: earlier intervention generally protects more.
Consistency is the quiet factor
Finasteride only works if taken regularly, and missed doses undermine it. Building it into a daily routine matters more than any clever trick. Some men combine it with minoxidil, which works differently; a prescriber can advise whether that suits you.
A practical tip: pair the tablet with something you already do daily, such as brushing your teeth, and keep the pack where you will see it. The first year is where the habit is either built or lost, and the men who get the most from finasteride are usually not those with the best genes but those who simply took it every day without fuss.
Managing expectations along the way
It is normal to feel impatient in the first few months, when there is little visible change and you are taking a tablet daily on faith. That is the hardest stretch. Reminding yourself that the mechanism works slowly, and that reduced shedding comes before regrowth, helps you stick with it long enough to judge fairly. Most men who abandon treatment do so before it has had time to show what it can do.
When to check in
Contact your clinician if you have side effects that concern you, if shedding is severe or does not settle, or if you see no benefit at all by around twelve months. A review is a normal part of treatment, not a sign something has gone wrong.
Side effects are uncommon at the hair-loss dose, but they matter, and the first year is when you learn how you personally tolerate the medicine. Most men notice nothing beyond their hair; a small number report changes in sexual function or mood. Our guide to finasteride side effects and the official product information both set out what to watch for. The rule is straightforward: anything that concerns you is a reason to speak to your prescriber rather than quietly stopping.
