Do they work you ask? Work for what???
The answer to your question will depend on what you plan to use the pills or penis pump for.
First, just to comment the statement made here by Sheik (that I hope was made in jest), that the penis is a muscle and should be exercised. The rise and fall of the penis is totally an hydraulic event! The penis contains three easily seen cylinders of spongy tissue aptly named the "corpus cavernosum", two are found on the top with the third nested below them. When the brain orders an erection it does so by secreting chemicals whose purpose is to increasie the blood flow to the penis, thus forcing more blood into the empty spaces in the c. cavernosum and increasing both its length and girth.
Viagra supplements the natural ability of the brain to increase the blood supply to the genitals. To accompish this amazing feat Viagra artificially increases the concentration of the chemical needed to open these blood vessels in the penis. This is also why Viagra is NOT an aphrodisiac, it won't cause an erection on its own, but only works when an erection is naturally desired and called for by the brain. Some men who have deteriorating or blocked arteries can not maintain a blood flow sufficient to inflate dicky boy e.g. the elderly and diabetics, and that is the reason for the pump or for Viagra etc.
The penis pumps about which you inquire, are often prescribed by Urologists as an aid to obtaining an erection, and NOT to increase size. What they do is create a vacuum inside a cylinder, this vacuum causing an increased flow of blood into the penis only, thereby inflating little dicky boy. As soon as the vacuum is released the erection will fail because normal room air pressure will force the blood back out of the penis. To maintain the erection an elastic cock ring (also a prescription item) is placed over the penis while still in the cylinder and before the vacuum is released.
Yes, there are real dangers of causing haematomas, very large and nasty ones too, if the vacuum is maintained too long or reaches too hich a level. The medical versions of these devices are usually equipped with a relief valve so that unsafe levels of
vacuum can not be produced. Those sold as SEX TOYS are not so equipped and therefore present a very real danger.
When a pump is first used it is suggested that the patient "practise" for half an hour a day to stretch the cavernous tissues. This produces a slight enlargement, but it is no greater than what would normally be experienced by someone in good health who is actively engaged in regular sexual activity.
If increasing size is your wish, then the only thing the "toy" versions of the pump being sold, will make larger are the incomes of the promoters!
I have no background with the pill gimmick but I am certain that it too its claims too are bogus.
Ooops, I see several others including Sheik have beat me to the punch here, howver I won't change the post!