A co-relation  between  the medical world and the world of vegetarianism is not hard to be established. There exists bond   between the two.
   Vegetarianism does not  merely  implies avoidance of consuming meat, eggs  and fish; it   also signifies  avoiding  consumption of any part of the body of an animal, in any from.
   Plenty of medicines, cosmetics and toiletries are made from the various extracts of animal's body. Intake of these drugs amounts to sustaining on a non-vegetarian diet and  leading a similar  lifestyle. It  is  a pity  that  a  vast range  of brands in medicines  containing  animal extracts, have  been  patented and regularly prescribed, whereas the potential in herbs and plant extracts in formulating potent drugs, have been overlooked.
  Vegetarianism also implies non-violence towards  animals and avoidance of their slaughter or torturing   them   for   experimentation.  Animals  are  being killed with abandon and their organs are utilized to manufacture various drugs. This cruelty towards animals is carried in, on the  plea  of  manufacturing  life-saving drugs for the mankind, when effective synthetic and plant-based formulations in the form of therapy medicines are easily available. 
 To illustrate the above point, let us examine this scenario :
 To tackle the phase of  menopause  in the life of middle - aged women,  doctors  advise  the use of pre marine, a  drug containing estrogens. Pre marine is made is made  from  the  urine of pregnant mares and they are impregnated artificially or otherwise, in  large  number, with the sole purpose of manufacturing these drugs. These pregnant  mares  are  hooked  up  to "rubber urine collection bags" and tied onto so tightly, they can  scarcely  turn  around  or even  take  a  step,  leave  aside  lying  down.   Many   of  these  animals  have  been  found suffering  from   swelling   in   their   abdomen  and   legs,  besides  having  oozing  wounds, blindness and infected eyes. The deriving of Pre Marin causes thousand of mares and their foals a nightmare of suffering and eventual death.
  In Order to manufacture Anti-Snake Venom Serum (ASVS), snake venom is  first  injected to horse and  subsequently  their blood is extracted. The process is  extremely  hazardous  and painful for the animal. The anti-bodies thus produced by the animal after the injection of the venom are used to make the serum and it is being practiced at a state-run Institute at Chenni. 
  Identical is the fate of goats, who meekly sacrifice, practically every organ of their body, for the benefit of the allopathic science. For the benefit of diabetic patients, Insulin is taken  out from the spleen of goats, vitamin B complex and  the  associated tonics  come  from  the said animal's   liver,  foam, protein  and  plasma  from  the   blood   of   goats,   whereas  anti-rabbi medicines  from  the  goat's  brain. Is not the  proverbial  "sacrificial goat"  seeming  a  reality, more and  more ? Many  other animals  are  killed  and  their  organs  utilized  to  manufacture various drugs. Several homeopathic drugs are, as well, made from animal  extracts. Pyrozanin is made  from  the  juice of burnt beef; fel tari is  got  from  the  pit  of  a  hippopotamus;  lacto dactus maisti  gets its source from black spider and the list goes on and on. A  few  instances can be cited the vast range of Homeopathic medicines which are made from animal extracts :   

Theridon               :  made from the essence extracted by crushing live spiders.
Valpis Hepas        :  made from the dust obtained by cursing dried liver of fox. 
Sepia                   :  made from the extracts of fish.
Vyunko                :  made from the poison contents of from which hunt sparrows.
Pierojeniyam        :  made by the juices of decayed cow meat.
Symax                 :  made by the crushed contents of cockroaches. 
Therend                :  made by the extracts from files.
Vaccinum             :  made from the pus obtained from small poxes.
Vipera                  :  made from the poison of snakes.
Quasia                 :  made from insects. 

 All this  inhuman act is talking place when several potent plant  based estrogen replacement
therapy  products  are  knocking  on the  doors of  formulating  laboratories  and  authorities 
sanctioning  patents,  begging  them  to show a route to  the  chambers  of  practitioners,  who 
could prescribe these gems of nature to the suffering mankind.
  Ayurvedic or plant-based medicines accompany lesser effects than Allopathic or Homeopathic drugs.
  Besides the above fact. the brand-formulations of allopathic drugs discarded, say at an interval of every decade or two, on the pretext of being obsolete and  redundant. New  formulations  are worked out and replace the earlier ones since their effectiveness diminishes. 
  This eventuality arises because of the experiments, before formulating  the drug,  being  carried out on animals, like  frogs, rabbits, mice, pigs and monkeys besides others,  who  have  entirely different biology and inner-construction than that of a human.
  A vegetarian diet is very useful in easing menstrual cramps and the treatment of liver disorders  including even the final stage of liver failure.
  Incidence of hypertension, diabetics and cancer can  be  reduced  considerably  by  avoiding a meat-based diet. Vegetarianism  also a plays a supportive role in the treatment of many chronic and neurological diseases.
  "A vegetarian  diet  can prevent ninety-seven percent of our coronary convulsions. In regions where meat is scarce, cardiovascular diseases are unknown". 
  The western countries, as well, have taken a note of these pertinent facts and are in the process of changing their habits, doctors are advising patients to have a vegetarian diet to ensure quick recovery and good health. Preparations  of drugs are being made  from  herbs and plant extracts whereas  courses  in  medical educations have been incorporated with  a  compulsory  study  of herbs, plants, and Vegetation vis-a-vis medicinal utility.
  Future of  progress  in  the sphere of  medical science lies in the research  and development  conducted  in  the  area of  detailed  knowledge  of  vegetation and its applications. Our  age  old knowledge can serve as guide in this regard.