One study does not mean a drug will come from it.

The problems involve:
making the product (often biologicals are very expensive, up to $10,000 a month or more). Some are made by DNA recombinant technology, so that has to be worked out. Others are extracted from animal tissue, and this involves risk of contamination by organisms. Things like IVIG are made from 1000's of blood donations, and have to be "washed" to remove viruses etc.

Extensive testing, in US are 3 levels. Looking for benefit and safety. This is very expensive and time consuming.

Marketing it...if it is only injectable like Neurotrophin-3 it has to be formulated to be STABLE and easily used. It may have to be a powder that is reconstituted, etc. Manufacturing it in sterile conditions is also very costly and must be developed for each drug. It might require injecting into IV only...which would mean doctors would have to administer it. It might have to be injected into the brain or spinal cord and that maybe very risky and involve hospitalization etc.

Problems can be allergic reactions, unwanted stimulation of other body systems, and in some cases DEATH is possible, from biological drugs. With a thing like Neurotrophin-3 and BDNF I'd worry about tumor stimulation on normal nerves..these are growth factors and may do that in humans.

It is really complex....VERY.

Now the Neurotropin (NT) from Japan is another thing entirely. It is used orally...it might come here more quickly. The names are similar, so don't get confused.

What may happen with the growth factors is that a stimulant substance may be discovered to stimulate the recipient into making more of the factor, and that would make it less expensive to manufacture. But FINDING the stimulating thing may take alot of time in itself.